Orgasm Problems

I’ve been with my boyfriend for almost 4 years and I’ve never been able to orgasm with him. Please no one tell me to leave him because we have a great relationship and he really tries to get me off. Dude spent a whole hour down there😂 It just doesn’t happen. I’m comfortable with him and everything. I just learned to get myself off with a vibrator a couple months ago, so I’m hoping I’ll be able to help him get me off soon. Anyone have any tips?