@mathieudugon Thanks for showing your specs. I gotta say your computer is way much better than mine. Probably Blender can’t handle your computer. I assuming.
Since you tried everything we had explained to you, maybe try different approach like save your blend file, exit Blender, restart the computer, and relaunch Blender. If that still don’t do the job then you can follow what @spikeyxxx suggested.
Sometime I sculpt in the older version, 2.79 as well when I had 2.82 and 2.91. These two have bugs so I uninstalled them and installed 2.92 and 2.93. to test their durability.
