I think it is time to switch my program because I keep stalling.

I did Stronglifts for about 10 months after I kept on failing and had to be constantly deloading. Moved on to PHUL for about 18 months. I want to increase strength, but muscle gains are much more important for me.

I have my eyes set on 5/3/1 with Boring but Big, however I feel that I am still a beginner/intermediate and not advanced enough of a lifter.

These are my 1RM:

Bench: 175

Squat: 225

Deadlift: 255

EDIT:

18M, 185 lbs, 6' 3"

DIET

I am eating around 50-75g of protein daily, which I know is below the suggested intake, but I don't feel like gaining any unnecessary fat. I do not like bulking/cutting cycle. I prefer to gain weight slowly and not gaining any fat. I don't eat dairy due to acne flareups which explains why my protein intake is so low.

What else should I be eating for protein that is not dairy?

Any suggestions?