How many reps do you do? You can do less reps, stay away from failure and add more frequency.
However if you can do only 1 rep, you should start with resistance bands or in a graviton machine and progress from there.
You should also do other movements to help you with back strength and hypertrophy, like rows and pulldowns. You can also train the negative part of the movements. Instead of pull you up, you start at the top and go down slowly.