Meshtastic® is a project that enables you to use inexpensive LoRa radios as a long range off-grid communication platform in areas without existing or reliable communications infrastructure. This project is 100% community driven and open source!
A couple that I haven't seen yet: Foolish Baseball for a zillenial take on baseball, Hagerty, Throttle House and savagegeese for quality car YouTube and Scott Manley, BPS Space and Vintage Space for some good rocket science and history, and languagejones and Dr. Geoff Lindsey for linguistics.
Much of that sounds all too familiar. It sucks, but it does get better. Have you run across Dr. Ramani on YouTube? She put a lot of what experienced with my ex in context.
Thanks! I'm pretty fond of Heinlein, so I'll check it out.