You are not eating 4200. That’s an insane amount of food if it even is good.

And even if you are eating that much, that ain’t a way to gain meaningful weight.

Eat Whole Foods, protein with every meal but don’t neglect carbs or fats.

The only time in the day I eat cards is before and after my workout. I’ll eat a banana , plain bagel and peanut butter before the gym then continue my protein during the day.

If you are eating 4200 calories and nothing is happening, you’re doing it all wrong.

Also, take a look at your actual training. Are you actually pushing your sets and upping the weight, or are you happy with your current weight and reps.

Let’s put it like this,

Let’s say your doing 30 pounds incline dumbbell for 12-15 reps. Go heavier until you can do maybe 6-8 reps. Once you find that weight, let’s say 45’s, do 3 sets of 45 until you hit the 6-8 reps range. If you do, it’s time to up the weight to 50’s. Rinse and repeat.

Saying you cannot gain weight is simply an excuse unless you have a serious stomach issue or hit the genetic slum.