Landscapers what should I do?

[Fanatical Meat]

Please pardon the poor pictures & mess, I haven’t trimmed the grass since last year.
Our house is raised from the street, we have a nice area for flowers which my wife loves.
We do have a problem separating the grass from the garden.
4 years ago I put down some Home Depot concrete bricks. Worked pretty good for 3 years then started to fall apart. See pictures. Amateur job and no saving the old concrete bricks now.
I’d like some suggestions that:
Would look decent
Amateur with minimal patience can handle
Tough enough to withstand the trimmer without getting damaged.

I’m okay with digging down a bit to level the area. Wife prefers stone or something that appears to be stone. Something that can stay on a hill with about a 60 degree incline. Needs to be affordable, doesn’t need to be super cheap but I’d like to keep the whole project under a few hundred. We have about 30 feet of area to cover.

Pictures:

**under the overgrown grass is the brick

 

[mxnerd]

I'll buy four raised bed corner blocks and three 2x6x10 pressure treated woods.

You can even stack them.

Easy, cheap, fast, done. No effort.

Not completely stone though.

https://www.homedepot.com/p/Oldcast...n-Brown-Planter-Wall-Block-16202336/206501693

https://www.homedepot.com/p/2-in-x-...l-1-5-in-x-5-5-in-x-120-in-17464-10/206949859

 

[olds]

60 degrees? You need an engineered retaining wall.

 

[olds]

See above

 

[mxnerd]

Looks more likely 16 degree, not 60 degree.

 

[Fanatical Meat]

It’s steep. I don’t want stone or bricks rolling down it.

 

[Greenman]

Dig it out, form with some bender board and short stakes, throw in a bar of #3 rebar, fill with concrete. Cheap, fast, and easy.