You should be able to file for free using TurboTax if you had minimal income and a simple tax return requirement. You can start a return for free in TurboTax and you will be notified if you are being upgraded to a program you have to pay for as you proceed.
You may want to file a tax return in 2020 if you did not receive your stimulus payments, but otherwise I'm not sure why you would want to file a tax return.
You can use this tool provided by the IRS to determine if you need to file a tax return in 2020:
https://www.irs.gov/help/ita/do-i-need-to-file-a-tax-return