ive tried to update it by my own but as i barely know java or kotlin i couldnt make anything at all i just updated to 1.21 but it was just crashing my game when joining

I was wondering the same thing; it's been about three years since the original mod maker updated it though so it seems unlikely. That said, somebody else (@R2bEEaton) did make a 1.20.1 version a couple years ago. Maybe something similar will happen again..?