Thank you for writing back with clarification. That changed my response.
If you stayed in the US for more than 183 days in 2020, you are considered as a resident for tax purposes. Switching from J to F visa, you do not count days you are present in US for five years in lifetime. You are considered as a nonresident for those five year. Since you have J-1visa once, that counts as one year. Therefore, there are four more years allowed as exempt. Based on your info, you would count the remaining four years as 2016, 2017, 2018 and 2019. Starting from January 1st 2020, if you stay more than 183 days, you are considered as a US resident.
If you have filed a Form 1040 for year 2020, you do not need to amend.
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