Tips on riding while short

Okay so I’m 5’0 and my bf is 6’4. We’ve been together for a while and I cannot get the hang of being on top. It’s his fav position but everytime I try I CANNOT get the motions right and trust me I’ve read so many tips lol. I’ve heard that sometimes this is harder for short girls because we don’t have enough length in our legs to move as much. Does anyone have any tips for how to ride easier when you don’t have a lot of leg length to work with? Or any other positions that are good for short girls with a height difference lol. Doggy, missionary, and spooning are getting kinda boring and I would love to be able to switch it up. Thanks!