The address to which you should mail your 1040 depends on what state you reside in and whether or not you are including a payment (the Kentucky address, I suspect, is for taxpayers enclosing a payment).
Note that the address given today may not have been the same address as for 2019 - they change them occasionally.
As for the slow turnaround, VolvoGirl is correct - the pandemic threw all schedules for a loop. Did you keep proof of mailing your return? You might approach the SBA with a copy of your return, your proof of mailing, and the canceled check (if you have one), and see if there is any leeway there. You can't be the only person this has happened to. After all, the Mail Box rule is that once you have submitted your return through the USPS, it is considered filed (even if the IRS never got it).
Otherwise, you will need to contact the IRS and ask them if the appropriate action would be to mail them another copy of your return (and if so, where).
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