New season

Hi!
after a long test phase, I’m ready to start with my competition.
What should I do to reset user predictions and then their rankings without deleting users, match schedule and match type?
Do I have to do it by hand putting my hands on DB tables, or is there a procedure to follow?
It would be very useful in the future to have a button in the admin panel of your plugin, resetting all or part of the content to start a new competition.

thank you for your time ??

The page I need help with: [log in to see the link]