did you conduct business in 2019/2020 in the name of the corporation? example providing FEIN of S-corp to vendors, customers, etc. then the activity should have been reported by the S-corp. To revoke the election, the corporation must file a statement with the appropriate service center listed under Where To File in the Instructions for Form 2553. In the statement, the corporation must notify the IRS that it is revoking its election to be an S corporation. The statement must be signed by each shareholder who consents to the revocation and contain the information required by Regulations section 1.1362-6(a)(3).
it would seem you haven't filed written revocation so if the business was conducted in the name of the S-corp you need to file the 1120-S for 2019 and 2020 and amend the 2019 1040. you also face significant penalties for late filing those returns. you probably didn't take a salary from the s-corp which can also be an issue.
based on the issues you are facing, I would strongly recommend you seek the assistance of a tax pro
