I had the passenger side window plague me over a year and a half. It’s like I would mess with it and get it working, swap a regulator, clean some pins, but it always came back. I went through 3 regulators and cleaned all the connectors and it kept happening. I ended up having to take the pins out of the connector in the door and bend them back into place so they would be tight, I also had to do this inside the boot where the wires pass between the body and the door, in the door jam. Once I re-bent the pins and the connectors where all tight again it works like a dream and has been for the past 2 years. There are videos on YouTube about popping the pins our with a paper clip, it’s super easy to do and then re-shaping them so when you re-install them they are tight again like factory. I would start there as it is free. If none of that works then it does sound like you need a motor.