This suggestion might seem a little low effort but hear me out…
When ao releases and you go to click on the “continue” button of a max level or any level file that was made before ao releases, have a prompt that says “It is recommended that you start anew, are you sure you want to continue?” And then two buttons underneath the text saying “Reset Level” and “Continue File”. This would happen to every one of your files until you have clicked one if the two options
Reason to add: while it would be good to start fresh in a new game, lots of people would disagree. Some People have spent ages grinding lots of files and as I have said in the past, this game tends to not reward time and effort, the people who want their files to be reset can have them reset, and there will be an option to do so. However the people who don’t want their files and progress and time to be wasted, get to keep their levels.
Thank you for listening
Have a cookie