Once every 1-2 months (sometimes 3-4 months once) cause our kid sleeps late. There’s no fixed amount of time for how often it should be, some couples do it every 2-3 days, some weekly etc etc.
I don’t think there is a “correct number” it depends on individual. Maybe you can try spicy it up or have a weekly planned date.
1-2 times a week is already very good. U want daily sex?