So, this is guess and I'm not a 100% sure if it's serene seasons (I've looked at the log it seems like it), but, since serene changes the biomes temperature and primal winter ALSO change the world temperature, it causes a bit of a problem and causes a crash
Crash Report
crash-2021-07-03_20.17.33-server.txt
Logs
latest.log

Also, Optifine is not the cause, I added Optifine and Optiforge AFTER the first crash happen, then it continued crashing, this is the latest one

NVM, I deactivated Serene Seasons and it crashes again

I'm an idiot and I just though it was that mod that was causing the crash... sorry!