For year of 2020, you are still considered as a nonresident for tax purposes. Here is why:
Per IRS, "you will not be an exempt individual as a student if you have been exempt as a teacher, trainee, student, Exchange Visitor, or Cultural Exchange Visitor on an "F, " "J, " "M, " or "Q " visa for any part of more than 5 calendar years, unless you establish to the satisfaction of the IRS that you do not intend to reside permanently in the United States, and you have substantially complied with the requirements of your nonimmigrant status."
See IRS link: Students not exempt
In your case, you are exempt for five years ( 2015, 2016, 2019, 2020 and 2021). Therefore you will be filing a Form 1040NR for those years. You can file as a resident starting from year of 2022 if you meet the 183 days SPT test. As TurboTax does not support nonresident returns, I would suggest you to visit Sprintax to complete your filing.
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