Prior year tax returns can no longer be efiled. A 2018 return filed after Oct. 15, 2019 had to be printed and mailed by you. A 2017 tax return filed after Oct. 15, 2018 had to be printed and mailed by you. If you tried to efile those returns in April 2020, they should have rejected. Tax returns prepared using the CD/download product installed on your computer for each of those years must be printed and mailed to the IRS. There is no way to track the status of prior year returns until the IRS starts taking phone calls again.
Did you by any chance use the current online product to prepare tax returns for 2017 and 2018. You can't do that. The current online product is only for 2019 tax returns. Tell us what you did and we'll try to help you figure out what to do now.
The IRS is way behind processing tax returns for refunds. All you can do is to continue to track the status using the IRS tracking web site: https://www.irs.gov/refunds
