Help me spice things up? Also maybe some tips on how to ride better?

I feel like my boyfriend is getting bored with our sexy times lol I mean it’s still good Nd he gets off but I feel like he wants more excitement. What are some things I can do to spice things up? Also can I get some tips on how to ride better? I’m chunky and feel like it’s harder cause my legs are in the way and I get tired fast.