Small retaining wall repair

So I have a small retaining wall where it looks like the footing and gravel is getting washed out.

Just wondering my best course of action, should I:

1. take falling parts of the the wall, dig it up and replace lost gravel and reset blocks

2. add some reinforcement 6”-12” in front of the wall and add dirt gravel then do #1

Curious as to thoughts here. If it was a wall not on a slope, I wouldn’t be having this issue I’m pretty sure. I’m unsure of the type of drainage behind it, if any.

Thanks for any input

picture of wall in question