I would fast track the stabilization of this first house hack, with a lot of plumbing infrastructure updates, new exterior doors/locks all around, some tree/brush removal, tuckpointing the limestone foundation, sister the floor joists, HVAC duct work to make the house more even, patch some critter holes and insulate the attic, and get my entire roster of attorney/CPA/etc figured out. That's my gut reaction of things I'd be pulled to do first.