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Agree that bands / negatives etc are best but there are a few other things you can do that might help ease the load. Some ideas: https://meghancallawayfitness.com/my-blog/learn-pull-ups-with-these-8-exercises/
Also, the little and often method (the calisthenics crew sometimes call it "greasing the groove") is definitely good for increasing volume, but obvs be careful if you've got rotator issues. Pull up bar across a door frame etc make this easy to do.
Do you have to do rotator specific physio (and if not, worth adding some to your workout)? I snapped the back of my shoulder joint off years ago, and have memories of having to do interminable number of "pull the exercise band across your body" variants to build the muscles back up.
Edit: just seen @zooeyzooey's post - what he said!
I know the answer to this but the only way to get better at pull-ups is pull-ups right?
They make me feel fat and weak.