Maybe a family in your area has a relative that would like to rent nearby but who doesn't think now is a good time to buy in this current housing market.You might even find someone who likes to target practice if that's a safe activity in your area. 

I just starting to get active in Bigger Pockets and saw your post today.

I was strongly considering joining before I read this, now I am going to go the hard route, but probably best to just stay active on here and go the extra effort to network with accomplished developers in my area.

I can sub out all the PM activities, leaving the "business" to me.  

While it provides a steady income stream and potential appreciation, it demands active management, thorough tenant screening, and may involve higher vacancy risks compared to traditional leases.

Right now treating it as interest but would like to make it active income to do a solo 401k .

You need to know your state laws and brokerage requirements so that you don't get into doing any brokerage activities unless you have the proper license.

Leverage Tech: What apps, tools, or platforms would you use to streamline your daily activities?

I am actively working on a buyer and a personal money lender list. 

Uses the syndication depreciation losses to help offset active incomeI did read your post mentioned above @Michael Plaks which is very informative.