Can I keep my US brokerage account in Japan?

Hello, l'm a Japanese citizen who's currently living in the US on a green card.

I have both a Roth IRA and a regular brokerage account in Charles Schwab, but I'm planning on moving back to Japan till my retirement.

Questions:
1. Can I keep both a Roth IRA and a brokerage account and keep investing trom Japan?

  1. Can I liquidate the investments in Japan and transfer them into my Japanese bank account?

  2. Will I be able to keep my US bank account even though I'm moving back to Japan?

I'd appreciate it if anyone could clarify the questions or share some tips on how to keep investing from Japan.

by Chester1182