It is too late to file a return electronically for those years.
If you’re due a tax refund (normally April 15th), you must file with the IRS within three years of the original due date. Taxpayers have, however, more time until May 17, 2021, to request a missed refund, as a result of the IRS’s recent extension of the 2017 tax deadline. The deadline to get a refund from 2017 is passed.
You can still file a paper return for 2018. The deadline is April 18, 2022, to mail in your return. Here is a link from TurboTax to help you file for 2018.
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