Male orgasm

Does anyone have any tips on how to enhance a male orgasm? My bf and I have been together almost 3 years and our sex life is amazing but from time to time he has problems with his orgasm not feeling as climactic or strong. I know it’s probably stress and circumstance (we always do it in the vehicle because our house isn’t done being built yet so we live with our parents) but I’m wondering if anyone has any tips on what I could possibly do that tends to drive men crazy, in a good way🤪