Worst case scenario, you have a new capacitor. Best case scenario, you save hundreds of dollars.
Here’s a video. You can even skip all the diagnostic tests, as all you care about is replacing the capacitor. If that doesn’t work, call an expert.
https://www.youtube.com/watch?v=bWH38Rg1iMI&pp=ygUeUmVwbGFja...
https://www.homedepot.com/c/ah/ac-capacitor-replacement/9ba6...