My Joy-Con Still Drifts After Calibrating It Three Times, What Am I Missing?

Nothing you did was wrong, and this is the single most common misunderstanding about drift, so please do not feel silly about it.

Calibration does one job: it takes a reading while the stick is centred and tells the console to treat that reading as the new zero. If the stick reports a stable wrong value, calibration fixes it permanently. Your case is the other kind. The sensor inside the Joy-Con is worn, so the value it reports from the centre position keeps changing. Calibration sets zero to whatever it read at that moment, then the sensor moves again and you are back to drifting. You could calibrate it thirty times and get the same result, because you are re-measuring a target that will not hold still.

The -0.22 reading is what makes this clear cut. On this hardware anything past about 0.10 at rest is physical wear. Joy-Con sticks are known for this and the good news is that Nintendo treat it as a repair matter rather than a you-broke-it matter. In the US, Canada and the UK the usual route is a service request for the Joy-Con only, and people frequently report it being handled free of charge even outside the standard warranty window. Send the Joy-Con on its own, not the console.

Two things before you do. Take any skin or cover off that Joy-Con, because a tight cover can press on the stick housing and mimic drift, and that one is free to rule out. And if you want a repair you can do at home instead, the stick module in a Joy-Con is replaceable, but it is fiddly work with a ribbon cable and I would not recommend it as a first repair.