Fertility

Me and my husband have 2 beautiful children 12 and 10. We have always wanted a 3rd baby but life got in the way. Me and my husband are both in our 30's I'm overweight 🙄 and he has diabetes. He doesn't cum a lot. Sometimes there's just a drop. What over the counter pills can he take to help with that? Should I take anything as well? My periods are very normal. What has worked for you guys before I spend money on anything. Fertilaid? Conceive plus? Anything else?