@limcoh before you actually walk away from filing ( 2021) as a resident --
(a) did you actually go to US embassy and declare that you are giving up your residency status ?
(b) did you realize that because you were a "longterm resident" IRS will essentially force you to be qa covered individual and recognize all gains -- mark-to-market.
(c) tax liability wise you are better off filing as a resident for 2021 -- standard deduction and start 2022 as a Non-Resident Alien ( assuming that you are eligible to do this.
Please tell me more about the steps you have taken to abandon your Green card, please
pk
