Cum position advice?

Taylor • African Hippie tracking her period ✌🏿️
I swear me and my boyfriend have been trying to get me to cum for the longest and it seems like nothing will work. But he's also fairly new to sex so we don't know if it's simply something he's not doing ..🤔 Is there a position that has always worked ? Or foreplay preparation that I should be doing ? Or any advice at all from people who have done it
Ps : I've done it once before and that was when my bf lost his virginity to me , he made me cum for the first time , but that was a few months ago and it hasn't happened since that one time