Freeze when I want to launch my map.

Hello, first of all, I want to point out that I use an automatic translator (I am Belgian and French-speaking.) so I am sorry if some sentence contain grammatical errors.

Explanation : When I want to launch my Minecraft map, the game freezes but does not crash. I have to stop the game manually. I’ve already waited five minutes.
It happened suddenly, my game is up to date but it is not due to the latter since I already play it under this version (1.16.220)

I’ve done this before:

1) Uninstall the game and reinstall it
2) Restart the game several times

Thank you for reading and trying to fix my problem.