This ticket proposes to update the contributions page on mobile to add a link to start a new contribution.
The page that lists your current contributions seems a natural place to provide an action to create a new one.
The link will lead to the user to the "New contribution" view that a separate ticket (T286466) proposed to be created. This will be only visible on the own user's contributions page (not when viewing somone else page).
The link can use the "Add" icon and be placed between the user name and the list of contributions, with a separator line on top. Another small change proposed is to align the user name to the left (right on RTL languages) for a cleaner layout:
Future tickets can consider a special empty state treatment that could potentially emphasize more the option to create new contributions.
For reference, this is the current status: