Can I achieve pull up? So far assisted pull up I need 50kg assist?

I'm 75 kg and when I try assisted pull up, I need at least a 50kg assist

I'm going to the gym most days for almost 2 years. I had a setback in May, I broke my collar bone. Before that I could bench 60kg
Now I can just about manage to bench 40 kg

My ambition is to do pull ups but I can only lift my 75 kg weight when I have 50kg assist

So is it just too much to ask at my age?
Can I achieve pull up? So far assisted pull up I need 50kg assist?
Post Opinion