Should the substantial presence test be applied each year?

[shahensha]

I am a student and hence was exempt from the substantial presence test for the first 5 years. As a result, I filed as non-resident alien. But after that, for a year, the exemption was over and I also passed the substantial presence test, hence I filed a resident alien. In 2019, I left the country wasn't present at all. This means that I fail the first condition of substantial presence test (viz. 31 days in 2019). How should I file my taxes? Should I go back to being non-resident alien?

[MinhT1]

If you do not pass the Substantial Presence test in 2019, you have to file your taxes as a nonresident alien.

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