What workouts will help plump my butt up?

Hello everyone so for years I have always been so depressed about my weight, I always wanted to gain more weight and get that butt I once had! And finally I’m there & I just been so happy with myself, happier than I ever been in my entire life really.

But the thing is about my butt is all the fat is on the bottom of my butt so on the back view it looks nice and big, but when you look on The side of my butt it doesn’t have shape to it, I don’t work out at all!

So what workouts can I do for my butt that will round it up and plump it up without losing my butt, I worked so hard for it to be where it’s at so I really don’t want to lose it! Thank you in advance