replace it.
It's probably a Teleflex.
Before you do, take it apart back at the motor and clean out the old grease/grime/rust/junk.
Then repack with good grease and try it.
If this doesn't work, it's up in the cable itself.
There are tons of YouTube videos on this you can watch.
They also show how to measure to buy a new one.
Not terribly expensive - typically under $200
Good luck