You should research energy policy and regulatory capture in the utility space. At this moment, it doesn't matter solar, wind, and batteries are cheaper than coal or nat gas. The energy services batteries provide are not appropriately compensated.If focus is truly on achieving the mission goals, then it's time to start thinking about selling automotive. A third party can expand "Tesla Motors" faster from here than Tesla on it's own.
FSD, GF1, GF3, and GF4 should all be bundled up and sold to Toyota or more ideally Apple for about $150B. Elon creates a new "Tesla Energy" entity which retains GF2, Supercharger network, Powerwall, all battery tech employees, and obviously the former SolarCity entity.
Stores, existing battery IP, Supercharger access, and a few other things would need to be "shared" in some capacity.
It's time to move on from transport and focus on Energy.
While the opportunity is huge, it takes time for these to grow into their potential. I see both auto and energy each over half a trillion eventually. That said, solar and energy storage is always going to be a more commoditized space.
FWIW, I got a model 3 and solar panels a few months apart, the car coming first. I did not choose Tesla solar because I got a better deal from a local installer. Forget 25% margins here. You'll be lucky to see 10% consistently for panels. And maybe 15% or so for the solar roof.