I would get rid of my US number completely, however, i have so many different accounts with 2FA. I hear google phone works, but if youre not in the US at least once a year they can deactivate your account.
My plan is to keep my number for 2FA purposes, and get a local sim for everything else. Right now we are paying for international package and its killing us.
Google voice - I have been away for more than 4 years and I am still using it for banking etc.
You just have to transfer your number to Google voice either while you are in the US or using VPN if you are already abroad.