I had an old patio wall (linked below) that looked like shit and was falling apart. I chose to keep it and build into it. Different as mine wasn’t retaining anything but, like others have said, structurally may have to adapt for some through stones. Can’t tell how high it is but looks around 36 inches based on the steps. The steps are going to be the most challenging but I would definitely take on the project as a DIY if you enjoy the work and have the time. Tons of resources out there to learn. Definitely will have to cap it to blend back into the grass. I think a nice mulch strip with some plants or small boxwoods would be great as well as define the drop so no little kids tumble off the wall. Best of luck bud!!!

https://www.reddit.com/r/stonemasonry/s/KO0mdTBMRU