Problems topping. Looking for advice

Before we met, my partner was exclusively a bottom, and I was a top. As time went on, those roles reversed and now he is the top most times and I bottom. I love it, but he has a hard time orgasming inside of me when he tops me. We’ve tried different positions and what not but I’m not really sure what else to do. Any input or questions you can ask me to help get to a solution are welcome.