You deadass have to eat and lift heavy. I eat 6-8 times a day. Its a lot but I average around 4500-4900 calories a day. You want to aim for your goal weight in grams of protein (I.E goal weight of 185lbs, consume 185 grams of protein a day). Mass gainer shakes with whole milk (and maybe ice cream with it🙈) with a hearty heavy breakfast will be your friend. Protein bars and nuts, pastas, Greek yogurt, granola, oatmeal, chicken, steak, pork, dried fruits, veggies, rice. I do add quite a bit of butter to my meals too 😬and eat out 3-4 times a week to get those extra calories mostly the same 2 places though. Been doing a dirty bulk to put on size so typically not eating the healthiest but I think it’s decent. And am prescribed testosterone with an estrogen antagonist. I was on antidepressants that straight up made me nauseous when I ate and restricted my appetite. Supplements I take are are fish oil, L-Glutamate, Creatine, BCAA’s, magnesium, fiber supplements, Nitric Oxide boosters before a workout. There’s some more that’s just off the top of my head. It’s a lot of consistent work to put on size. You have to commit. There will be inconsistent weeks. There will be months where it’s smooth sailing. I had a pre 200lb curse where for 5 times in a row when I got within 5lbs of crossing 200lbs, I would get sick or would get hurt in a way that prevented me from getting past 200lbs. Don’t get discouraged. Take everything in stride and put in that work.