Battery calibration issue? My Switch dies at 50s% battery, but the standard recalibration method does not seem to work?

My Switch 1 automatically "shuts down" (into a sleep) with the empty battery warning screen and beep even though the battery icon shows it's at 50s%. I press the power button, and it simply wakes up (it didn't "turn off", just asleep). And then about ten seconds later, the same empty battery warning screen, and it "shuts off" again, which is entering a sleep mode.

I checked online, and the Nintendo website says that rather than it's the fault of the battery itself, it's the fault of the battery calibration. So I resorted to the common fix of updating to the latest version, turning the auto-sleep mode off, charging my Switch to 100%, plugging off, keeping the home menu open, letting Switch drain to 0%, and repeating process three or four times.

Well, my problem is that Switch automatically "shuts off" at 55%. It goes to the sleep mode. It refuses to drain to 0%. So I decided to turn on my Switch manually every time my Switch goes dark, and I did that several times until my Switch does actually shuts off.

I powered on, and the battery now shows as 58%. Five seconds later, Switch immediately turns off without the low battery warning screen. Now, I can't turn on my Switch until I connect a charging cable to recharge it, so I'm returned to square one.

I seem to be stuck. Is my battery actually drained at 58%, or is the system showing it wrong? Should I treat this shutdown as 0% of the battery and repeat this process to fix this issue as the Nintendo website says? Or is there something else that I am not grasping?