Any small city with computers, honestly. There are tens of thousands of senior developers, architects, programmer analysts etc that are making $100k or $125k or more in cities you've never heard of with a cost of living that is a small fraction of Silicon Valley. Yes, you're going to find a lot of .Net and Java work, but there's more cutting edge stuff as well (and plenty of the .Net and Java developers I know love talking about Vue or React or anything else tech).

But you need to be okay living in a city nobody's ever heard of, working for a company nobody's ever heard of, and not changing the world. But honestly 99.9% of the people working 80 hour weeks in VC funded start-ups writing the next big CRUD app aren't going to change the world either, and they're paying $3500/mo to rent a 1-bedroom while people in these small cities are paying $1k/mo for a 2-bedroom mortgage a 10 minute commute from their office.

Pick one. There are thousands across the country!