How to build muscle in the shape of a Dorito? (slim waist, big chest)
Hit the weights harder than you ever have before. Reign in that diet. And pray you have some good genetics.
Your chest, lats, shoulders, and arms are going to be the biggest visual influences here. If you build these well it should create your desired body shape.
Diet is key. Eat big and you will grow big. Make sure to eat smart. Learn nutrition. Count those macros (or eyeball it semi-accurately).
Genetics plays a huge role here. Some people have no hope for this at all.....but you can get close with commitment.