You should not file Sprintax. You can use TurboTax to file.
You are exempt for two years. Therefore, you are considered as a nonresident for both 2018 and 2019. Starting from January 1, 2020, if you stayed more than 183 days in the US, you are considered as a resident for tax purposes and will be filing a Form 1040.
When you received 1099-MISC and 1099-NEC, IRS will treat you as self employed. Besides your regular income tax ( based on your taxable income), you need to pay an additional self employed taxes of 15.3%. (12.4% for social security for old-age, survivors, and disability insurance and 2.9% for Medicare for hospital insurance). It will show on line 4 of Schedule 2 and line 23 of the Form 1040. Without seeing your tax return, I would not know what your total tax rate will be.
If you follow through the steps in the TurboTax program, the program will calculate your taxes correctly. I am attaching the 2020 Form 1040 tax table for your reference. https://www.irs.gov/pub/irs-pdf/i1040tt.pdf
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