What else can I try?!😥

16cycles trying and nothing. I have been checked for a couple of things and I ovulate. Hubby hasn't been checked yet. I have used preseed, cut caffeine, I workout, he works out, I use opks, we bd a lot, we bd a little, I lay down after Sex, we do different positions. Idk what else to do! We conceived before without even trying. I'm 26 and he's 28