Keep getting this MSG "Errors in currently selected datapacks prevented the world from loading. You can either try to load it with only the vanilla data pack ("safe mode") or go back to the title screen to manually fix it" but only happens with any update above 0.32 any ideas on how to fix

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I believe this is an issue with Biomes O Plenty. The only way to preserve your world going from 0.2.32 to 0.2.35 is to rollback the Biomes O Plenty mod to the version used in ATM7 0.2.32.

If this does not resolve it I would suggest to try and update to a new profile, and see if you can load the world in the new profile

How do you rollback the mod version?

copy the mod's .jar file from a .32 install to your .35 install, and delete the newer version.

Do note, you may need to restore a backup.

had the same problem. my folks were able to play for two days tho.
after it crashed however now the server cannot even run for a minute without any player connected.
the server max tick time exceeded 60000 right after restart and forced a restart loop.
(while the TPS were still fine, shortly after startup up to 50 but then going down to 10-15)

downgrade from 0.2.35 to 0.2.34 was as easy as updating and the world is fine again.