Cannot make my man cum during a blow job... HELP!!

So me and my man have been together for over a year. I have no problem with making him cum during sex and he has no problem making me cum while eating me out..

But everytime I give him a blow job, it takes so long and I cant seem to make him cum.

He enjoys so much, dont get me wrong..

I've used many techniques and moves but none seems to get it going.

I always tend to get tired or my mouth starts to help..

So does anyone got tips on how I can give my man a mind blowing, cum on my face blow job? 😜😜😅💦👅