The monthly SS benefit you will actually receive is based on your 35 highest earning years. And IIRC some kind of inflation adjustment is applied to your earnings so your early years and late years will have equal weight.
The question you need to be asking yourself is, "Do you feel lucky?" If your 2020 or 2021 income is among your 35 highest, your lowest earning year will fall off the list and your actual SS benefit will go up. If neither year is among your 35 highest, neither will be added to the list and they will have no effect on your actual benefit. IMO if you think the current year will be among your 35 highest, you should keep working because every dollar you make will count. If the current year won't be among your 35 highest, go ahead and quit if you want to.
The SS estimates you're looking at are like weather forecasts; a best guess based on you earning the same amount this year that you earned last year.
True story: I applied for SS in January of 20xx. During the 90 days I had to wait for my SS benefits to start, I earned a bit more than $7000, and one of my 35 highest earning years was less than $7000. So, my tiny $7000 20xx income pushed a worse year off my record and increased the SS benefit I'm receiving.