Nothing kills desire as reliably as becoming co-managers of a household. The problem is rarely the chores themselves — it is that the entire relationship becomes logistics.
Have one conversation a week that is not admin
Most couples living together talk exclusively about arrangements. Deliberately spending time not doing that is unglamorous and effective.
Resentment about housework is a bedroom issue
It is difficult to want someone you feel you are cleaning up after. This is one of the most underrated causes of a dead patch.
Get dressed sometimes
Not a rule, just a fact: couples who never see each other looking like anything other than tired often report exactly what you would expect.
Leave the house together
The same two people in a different room behave differently. It is a cheap intervention and it works far more often than it should.