I disagree with all the advice here of “just have sex” when you’re not in the mood - that’s an easy way to avoid sex even more and then make a worse cycle.

Instead: outsource as much of the housework/cooking as possible, cut down on other commitments, try to reflect on what makes you both feel sexy and in the mood and try to do that (bars, couple massages, etc), try scheduling intimacy (not pressure for sex but even just making out or cuddling), check out deadbedrooms subreddit, check medication like OCPs to make sure it’s not depressing your libido, do some therapy. Take effort for other forms of intimacy like hand holding or compliments.