Would be interesting to take the motor apart, some people have found significant corrosion inside the armature case, others have found damaged teeth of the plastic gear.
If it doesn't move at all now then likely either a dead motor and/or a stuck or bent/damaged regulator. Only thing to do now is to pull the motor and regulator out and look for something broke. And while it's apart if the motor is the original and even if it seems to be working might as well...
Weak motors. When the window glass goes down it has a gravity assist,
when it goes up the motor is working against gravity (the weight of the glass).
The regulator spring does help some as it winds up (gets tighter) on the way down, but with a weak motor (or bad/corroded connections/grounds) it...