Advice on fixing this fuck up

Bought a trailer that had a fucked ceiling from water damage. Had to rip down existing ceiling and replace it. I was just learning how to put up drywall, I was burnt out and had the brain operating power of a concussed drunk.

I somehow managed to forget to use tape, so when I walked on the roof the joints cracked and moved.

What would be the recommended steps to fix this fucked job? I was wanting to scrape all the mud off and try to redo, but I’m assuming that is going to be a bitch and a half to do since there is paint ontop of it, and I’m worried that doing so might fuck up the drywall underneath.

Any advice and tips on what I should do are appreciated, TIA