You are considered as a nonresident in 2020. Per IRS, if you held F-1visa in both 2014 and 2015 and then came back in 2018 until present, your five years exempt are 2014, 2015, 2018, 2019 and 2020. Also, the a five years exempt under F visa is considered as a life-time event. Therefore, if a student returns to the US with F visa multiple times for school, he or she will add up all those years while being present the US. Do not count the years while not present in the US.
Starting from January 1, 2021, if you stay more than 183 days in the US, you will be a resident and file Form 1040.
See reference, click here: http://blog.sprintax.com/us-tax-residency-status-explained/
@ErnieS0@kemcaycalem
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