You will be considered a resident for all of 2021 and will file a regular Form 1040.
F-1 visa holders are not considered residents until their 6th calendar year in the United States. At that point, the Substantial Presence Test would need to be met to be considered a resident.
You were exempt for the years 2016-2021 and met the Substantial Presence Test in 2021 (all days in 2021 counted and you were 183 days in the US). If you meet the substantial Presence Test for a calendar year, your residency starting date is generally the first day you are present in the United States during that calendar year.
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