The other day my rear drive turn signal stopped working. I replaced the bulb thinking that was the issue. But it was not and it just the rear driver side blinker that doesn't work. Please help.

Welcome to the forum.

First thing to try is disconnecting the car battery at the negative
jumper connect for 10 - 15 minutes to see if it's a TIPM fault.
If that has no effect you may have fatigued/broken wire in the
rubber covered loom that goes from the cabin to the rear door
or poor ground from the light assembly.

I'll start trouble shooting with the battery and go from there.
Thank you.

Keep us posted on how everything goes!