Mass moves mass, especially on bench. Protein powder is good, u need other things to complete the chain in order to round out your diet. I've been lifting for a long time and I plateaued for a while and I was constantly taking the same supplements hoping for results (mass gainer+l-glutamine for bulks and l carnitine at most to help me cut) I switched to finding these things that are naturally occurring, like how some fruits, peppers, and veggies can speed your metabolism, or help you with intake
I haven’t really been putting on the weight though, I’ve been eating 3000 cal a day for the past few months and only put on about 2 pounds. My chest and tri day includes bench, incline dumbbell press, cable crossovers, tri press down, overhead tri extension, lat raises, and overhead press.
Fattier foods will slow down your metabolism. If you are only eating protein you are only burning protein. Eat in caloric surplus. Don't believe metabolism stuff unless you're genuinely eating 10x more frequently and consistently than the week before. You need to have a round diet in order to go anywhere in my mantra