Sex tips

I'm new to this app.
​My boyfriend and I are 19 and 21 and have been together for almost a year now and I was just wondering what are some ways to heat things up in the bedroom and keep him from getting bored? 
​He is usually on top because i'm not too comfortable with myself being on top and he's never said he minds it but I'm sure he'd like a break every now and then ya know?
​I was just curious to see if anyone had any ideas for me.