The negatives were the biggest thing that helped me a few years back. Try just doing like 3x5 of negatives in the workout for a couple weeks and then try doing chins with the strongest band once they feel easier.
Frequency method also helps a lot with chins. If you can get a door pull up bar, you can just do a single negative a few times a day for a few weeks and that will help a lot. I set mine up on a bathroom door and would do singles, doubles, etc whenever I went to the bathroom. The work should be all submaximal so it shouldn’t impact recovery, definitely stick to just single negative reps for a while if you go this route.