Any advice?

So a couple days ago I gave my boyfriend a bj and I know I did a pretty good job because the day after my throat, cheeks, and tongue basically my whole mouth was sore. But when I gave him the bj he didn’t cum he had to do it himself it was so embarrassing! I don’t know if I’m doing it wrong. Don’t get me wrong he still loved it but I wanna be able to get him to cum. Can anyone give me some tips on how to help get there with me doing it