Higher efficiency panels + vertical panels would help. Most houses have decent south-facing walls.

Ground mount is also an option in many places.

20kW ground mount array in NH produces twice as much as we need for our 4 heat pumps heating 3000 sqft. Went into the last two winters expecting to deplete our summer credits with the power company but we have only used about 1/6th of it.

Definitely doable.

6.7kW ground mount here in NM, still can't heat my home in winter in this climate (would need 21kW with my Mitsubishi hyper-heat units). We have relatively OK passive solar contributions too.

6.7kw is tiny. The smallest install I’ve personally seen is 15kw.

Pretty standard size for New Mexico. I have numerous neighbors with 6-12kW systems.

Live underground and convert your whole yard to arrays of panels!