If you had some money, I’d maybe look into building a multigenerational center.
The residents of Detroit have also done some things you could mimic. In the fallout of the 2007-8 Great Recession, the entire city saw huge desertion. The people who stayed saw the city becoming a ghost city all around them. There are probably things and ideas there to help you in your quest.
If I had infinite money though, I’d even consider doing seemingly hard to politically envision things like employing the locals en masse. Preferably it’d be in things like long term investment. Maybe you could bootstrap some local industry with long term sustainability. Simply giving people work that pays better than crime will get crime off the streets in large part.
One way of this would be to make a societal dormitory of sorts. Basically a large building where people can get just enough of a space to themselves to have a place to be. Have a cafeteria so you can benefit from economies of scale. Have things like a laundromat and garden for giving people things to do, further economies of scale, and healthy options. Give them maybe 20-100/week to figure themselves out. Have in house therapists, etc.