Wait until it does fail (it may keep going for longer than you expect), then call a servicer. Or call a servicer now for an assessment of the situation. Compressor replacement is not a DIY repair for someone without the training and required special required tools and equipment.

Thank you. I’m definitely not qualified in any way-just wondering if it’s possible to buy a compressor myself and/or find an installer other than GE?

Parts can be found at online sources by the model number (which you haven't cited). Some items for a 20-yo-unit may be NLA. There are independent appliance servicers in most medium to large towns, certainly in larger cities. A hired servicer may refuse to install a compressor that you source yourself, or not provide a warranty on the work if he/she agrees to do the job.