Trying something different

My husband and I usually have sex ALOT we have sex for two days, skip two days.. and so on (even during my af). Mainly because we just can’t help it. However, we’ve been ttc for 9 months for our first, with no luck. I decided to try a different scenario, maybe letting his sperm build up. I figured we’ll skip a day.. bd, skip a day, bd... and so on. But what day should I we start? I usually ovulate late (identified by opk’s and bbt). Advice? Thanks in advance!! 😊