Letters and numbers are the only working keys in my keyboard.

My keyboard’s only working keys are the alphabets and the numbers. Initially, the left-shift key stopped working, followed by the function keys. This was on the start of quarantine. This year, the Caps lock key, space key, and the other keys started to fail (establishing a timeline). I put it to sleep because I speculate the power key might also not work. Also, forcefully and repeatedly pressing works only for the spacebar and right shift key.