2020 tax returns were rejected due to AGI

Hello,

I mailed my 2019 tax returns last year around March and the IRS still has not processed my return. I sent a check along with my return because I owed a small amount, but it did not take long for the check to clear. Anyway, I tried to file my 2020 tax returns electronically this time around, but they were in fact rejected due to the IRS not being able to confirm my identity through my AGI last year. Why is it my fault that the IRS cannot process my return in a timely manner? Isn't there another way that I confirm my identity? This whole thing is stupid. I don't want to file my returns by mail either. What options do I have?

Thank you!