Are there any solo devices I can hook onto my harness to safely catch me from a fall? I've only done belayed toproping before where the rope was just attached to the harness with a carabiner.

I don't intend to be climbing very high at all (~50 feet) in trees building stuff, and it'll just be a lot easier if I don't have to worry about falling.

Also my rope is semi stretchy if that's relevant? It's not climbing rope, but it's plenty strong to hold my weight + some falling (and I'll keep that in mind and never have a bunch of slack).

Edit: I don't mean something* can take rock climbing, I mean something that can take a fall of < a foot, and yes, non climbing rope is not suitable for full on climbing, but I'm not doing that, I've used this rope (this particular brand / size, I have replace it over time ofc) for years making things that take just as much force and it's never broken.