We can go that route too if you want. 
Basically, I made my most gains when I was lifting with other people who lifted more. They were able to spot me on a lift I knew I couldn’t do but I could just feel the wait. I see a lot of people doing 225 X 8 but can’t do 260-275 X 1-2+.
Also, another person forces you to do the last rep that you normally wouldn’t do.
Anyhow, eat protein and do a lot of dumb bells and incline. Keep reps to 3-5 and keep moving up.