Won’t give me an answer

So I often ask my boyfriend what I could do in bed to make him feel better or what he wants to try. He’s open to so many thing and tells me if I do something that he doesn’t like, but whenever I ask him what he does like, he says “everything”. He never gives me any more info or any less!What should I do? I want to improve our sex life but he’s giving me nothing to go off of.