Eat more, I’m sure you know to find your maintenance calories, but also account for calories while burning during lifting and whatever you do for work unless you just sit at a desk all day. If you’re 6’5” chances are your maintenance will be pretty close to what you’re eating now since that is pretty tall and your body will require a decent amount of energy just to function. I’m 6’1” and 150 at the start of a bulk and I found milk (which I’m sure most coaches won’t recommend) helped a lot, easy calories on top of a meal. Also I know the coaches are big on fruit so maybe try some dried fruit to snack on, easy and digestible carbs. Hope this helps
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