After you file

IRS.GOV still does not show 2019 1040 that was mailed a year ago. Payment was cashed by the treasury and shows the date and my SS number. What to do now? refile? IRS phone numbers are robot driven and are no help always ending in a dead end.

as a result, I was unable to e-file 2020 1040 and had to mail. Now I am concerned that both are lost.