Home HVAC condenser fan not spinning
The capacitor is the most likely culprit . They are easy to change out (with the power off). They are usually silver cans with several connections on 1 end. You need to find the size it will be something like 15mfd then the voltage. It may be a dual element then there will be 2 numbers like 15 - 28 mfd.
Make sure to write down the terminals the diferent wires go to so you get them correct on the new one. The caps can be found on line for the best price.