I tried everything, but nothing worked. I found an old backup, and too bad for everything I lost, so I started a restore with All-in-One WP Migration, which remained stuck at 89%. So I refreshed and broke everything.

Now, via FTP, I delete everything and redo a clean installation, even if it takes time, whether via FTP or the OVH 1-Click module.

I hope I didn't make any mistakes.