* https://www.greenbacktaxservices.com - give them your foreign tax return and they file your US return
* https://wandererswealth.com - international tax consultant
* https://nomadcapitalist.com/book - modern flag theory, talks about moving your life and business overseas to control your tax rate
For bank accounts, I had trouble opening them in Germany (US citizens are to foreign banks like GDPR is to US companies) except for Number26 however that's an online-only account:
Edit: Why am I getting downvoted for sharing useful resources? I'm not affiliated with these links in any way.