You are correct that you are a US resident for tax purposes. Based on your information, please note that the days while you were on F-visa including OPT do not count towards your SPT calculations. Therefore, since you have stayed in the US for more than 183 days in both 2020 and 2019, you meet the requirements. You can use TurboTax to file your 2020 tax return.
@Claire_He
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