I updated to the latest mca and radiax core yet in my world every villager dissapeared pls help

??

This should be easy. What destiny did you choose? If it was "I live alone" or "None of these", you might not see any villagers.

I am not sure, how can i fix this? i backed up the world before i did this

like there was no villagers in the world at all, and i had a wife and kids before the update and my friend as well

If you were using a version of MCA before 5.x, villagers will disappear. Otherwise, it would be an issue I was not made aware of after an update and it wouldn't be possible to recover any lost villagers.