Your filing status is determined by your status as of 12/31 of your tax year. There are options since it seems from your question you were still technically married as of 12/31/21.
There are different situations that are necessary for each option as well as some options that deny you some credits. Since I don't know your whole situation, please see What is my tax filing status (single, married, etc.)? for the best info to help you out.
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