@shirleynobody , while there are really no new requirements for filing as a resident alien for tax purposes, there are items that one needs to make sure before filing as a resident. So let me ask you a few questions first:
Which country are you from; what visa are you on; when did you enter the USA and with what visa; how many days did you spend in the USA f ( for any purpose/ any visa ) during 2018,2019 and 2020; are you married ( and if so to a US citizen/Resident or a Non-Resident Alien); etc. etc.