Only play on right side

I had this happen to my old pair of headphones, back before I was into repairing tech, so I simply replaced them.

Before getting rid of them I did inspect them, and found that the wire leading to the other side, had frayed and been damaged.

My suggestion is to first inspect the headphones. Another tactic is to go into your devices settings, and set it so that it only plays noise on the right side, once you do this, take them off (DO NOT WEAR THEM FOR THIS TEST) and set your volume to MAX, you should be able to hear this way without wearing the headphones. Then, take the headphones, and fidget around with them a bit; rotate the ear pieces and move them around while listening for noise. You might get some noise when doing this, meaning that it’s probably the wiring. I suggest doing this in wired mode and not Bluetooth