Only having sex 1-2x per fertile cycle

My husband and I have a 15month old and we really want another, but we’re honestly completely exhausted and find it difficult to prioritise sex over the minuscule amount of sleep we already get. We’ve only been having sex 1-2x per fertile cycle but we’re too exhausted to do more. The first baby was so much easier!!! 9 months TTC and with sex only once this month I think we’ll be on month 10 TTC soon.. Anyone in a similar place?