@jabba1495 I am also in plateau with pull-ups stuck at 2-3 sets of 8-9 reps. My goal is 3x12 or 4x10
What I think helps in any Plateau: add new stimuli, add changes, surprise the muscles. Less/more frequency, less/more sets, less/more weight, different way of working the muscles, different directions, different focus (negatives, hang on bar to improve grip strength, etc).
For some people Grease the Groove works (less reps but many more sets), for others adding weight (belt) then after a few week(s), remove the weight and it your body weight feels lighter and you can add more reps, etc
Extra Tip: try using pre-workouts for extra strength, and creatine. Also, sometimes eating a bit more helps, extra kcals = build more muscle. I don’t know if this will help with Pull-ups but for me worked well for chest, shoulders, arms, etc