Chapter-16 (Time Skip Arc!)

                                    

                                          

Now, Naruto had learned many powerful jutsu. However, he continued his training to increase his proficiency. 
Naruto's skill list included:
·         Flying Thunder God Technique (S-rank)
·         Fire Style: Rasen-Cannon (S-rank)
·         normal Rasengan (A-rank)
·         Rasengan Bullet (able to shoot Rasengan) (A-rank)
·         Wind Style: Gale Palm
·         Multi-Shadow Clone Jutsu (A-rank)
·         Fire Style Jutsu (B-rank)
·         Genjutsu. 
With these skills, Naruto could easily overpower Kage-level shinobi. His chakra level was now higher than 16-year-old Naruto, even though he was only six years old. And so, Naruto continued his training.
Whenever Naruto trained, his chakra increased because he kept pushing his limits. Being a child, his body easily adapted to the training, and with Kurama's influence, his fatigue and exhaustion were quickly healed. The leakage of Kurama's chakra from the seal also enhanced Naruto's healing and increased his chakra reserves.
Naruto continued his training to increase his jutsu proficiency. He was able to create 2,000 shadow clones, and with this, his one day of training was equivalent to 2,000 days due to the shared experience of the multi-shadow clones. Naruto regularly asked Hiruzen and Kakashi to teach him all chakra natures. He easily learned all chakra natures except for Lightning Release Jutsu, which Kakashi refused to teach him despite Naruto's persistent requests.
After learning all the chakra natures from Hiruzen and Kakashi (except Lightning Release), Naruto continued his training in secret. He went to a secluded place at the border between Konoha and Sunagakure, sending one of his clones to attend the academy. No one, not even Kakashi or Hiruzen's guards, noticed Naruto's training.
Every morning, Naruto would teleport to his training spot using the Flying Thunder God Jutsu and return home in the evening using the same technique. He continued practicing every jutsu he had learned with his 2,000 clones. Thanks to Kurama's enormous life force, Naruto easily healed from exhaustion and could push his limits higher every day, with his injuries and fatigue quickly mended by Kurama's chakra influence.
With this intense training, Naruto's chakra reserves continued to increase as he constantly pushed his limits. Each day, he grew stronger, his body adapting and expanding its capacity to handle more chakra. Thanks to Kurama's influence, Naruto's healing accelerated, allowing him to recover quickly from any fatigue or injury, enabling him to train even harder the next day. As a result, his chakra reserves kept growing, making him more powerful with each passing day. 
6 year later
Naruto was now 12 years old, the age at which the actual Naruto anime begins. Despite his extraordinary training, Naruto didn't change anything in the timeline. Everything happened flawlessly, including the Uchiha massacre. Every incident unfolded as it originally did because Naruto chose not to interfere.
Over the past six years, Naruto's strength had grown exponentially, surpassing even kage-level shinobi. Training with 2000 shadow clones every day had a profound impact. Six years of such rigorous training meant Naruto's chakra reserves had increased to six times that of adult Naruto. His proficiency in jutsu had reached unprecedented levels, allowing him to teleport in the blink of an eye. 
"Imagine six years of training using 2000 clones... how much experience he would gain. "
After the time skip, if Naruto created 2000 clones, each clone could use the Flying Thunder God technique at least five times.
Naruto's skill list after time skip
Flying thunder god jutsu (S-Rank)
Naruto's proficiency with the Flying Thunder God Jutsu has increased to the point that he no longer needs to use hand signs. His speed and reaction time have reached another level. With the training of 2000 clones, he can spam the Flying Thunder God Jutsu as much as he wants. if Naruto created 2000 clones, each clone could use the Flying Thunder God technique at least five times.
Fire Style : Rasen-canon (S-rank)
When Naruto was 6 years old, he could only create one Fire Style: Rasen-Cannon the size of a 1-meter radius Rasengan, which could create a destructive blast with a 100-meter radius. However, after six years of intense training, he can now create ten Fire Style: Rasen-Cannons of the same size. Due to his intense training, Naruto's chakra reserves have increased to another level. Able to shoot rase-canon..
Rasengan (A-rank) : He can create Rasengan as much as he wants and is able to shoot Rasengan.
Rasengan Bullet evolved into Rasen-canon bullet 
We all know Naruto was able to create a mini version of Rasengan and shoot it like a bullet, which could pierce through trees and boulders. With increased proficiency, Naruto was able to imbue fire style into this mini Rasengan. When Naruto shoots this mini Rasen-Cannon at a tree, it pierces the target and creates a big blast at the point of impact, completely destroying the tree. That's how powerful the "Rasen-Cannon Bullet" is. If aimed at a boulder, the Rasen-Cannon Bullet pierces through it and blasts the boulder from the inside out. With this jutsu alone, Naruto could overpower every shinobi in the current timeline.
Genjutsu level increased
Naruto learned genjutsu from Kurenai. At first, he struggled, but eventually, he was able to master it. However, he couldn't put Kakashi under genjutsu because Kakashi, possessing the Sharingan, easily repelled it. After six years of training, Naruto's genjutsu proficiency reached arsenal to  insane level. He could use multiple genjutsu simultaneously with multiple shadow clones. With this intense training, Naruto's genjutsu arsenal expanded significantly. He could continuously use genjutsu with his 2000 clones, making it impossible for anyone to withstand Naruto's genjutsu.
Chakra nature:
Initially, Naruto learned wind style, and after mastering it, he delved into fire style. Once he had a grip on these techniques, Naruto learned all types of chakra nature from Kakashi and Hiruzen, except for lightning style, as Kakashi didn't teach him. Over the course of six years of training, Naruto fully mastered fire, wind, water, and earth style jutsu, reaching a high level of proficiency. His proficiency significantly increased with this training, elevating his nature release to a high level. With his enormous chakra reserves, his fire release alone could cause impacts like infernos, his water style jutsu could create floods, his wind style jutsu could summon storms, and his earth style could trigger massive earthquakes. Except for lightning release, Naruto mastered all chakra nature.
multi shadow clone jutsu
With the aid of the multi-shadow clone jutsu, Naruto easily mastered all of these jutsu, drawing from the shared experience of his 2000 shadow clones over six years. Naruto elevated every jutsu into arsenal to insane level, transforming them into a formidable arsenal.
(Now that Naruto is 12 years old, the actual anime timeline begins. With his plethora of techniques, skills, and destructive power, how will Naruto alter this timeline? We'll soon find out. Naruto has made the decision to graduate from the academy. Let's see how this version of Naruto will reshape the timeline. Stay tuned.)