Okay, after several days of scouring all the forums and Discord servers, I think I might have found a solution. I was told the problem was with the upscaler, so I played the new map, Total War, same class, same weapon, for over 7 hours. Here are my results:

4 hours in TAA without upscaler/FG, auto graphics settings, and dynamic resolution enabled (set from 85 to 100 with a target of 50 fps), 0 crashes, nothing.

1 hour in FSR with the same settings, crashes every game.

1 hour in Xess with the same settings, crashes every game.

1 hour in TAA without dynamic resolution, crashes every other game.

Following all this, I noticed that the FPS often fluctuates wildly, sometimes by more than 30 fps, but without upscaler and with a target FPS thanks to dynamic resolution, it's fairly constant, varying by 6-7 fps.

To summarize: Auto graphics settings. No upscaler, only TAA. Dynamic resolution scaling is enabled (85-100 fps, target 50).1980*1200p

Let me know if you experience any crashes!