So, I started with a couple build-to-rent homes, then a couple more, and then felt comfortable to build a mini development.

Personally, I advocate for a long-term investment strategy and would recommend investing the funds, provided you are comfortable with the expected return on investment over time.

Start running numbers on potential deals to get more comfortable, and build out your team—like a CPA, property manager, and lenders.

With interest rates on your current properties in the range a stock market portfolio might return paying off the mortgages could be a good option so you maximize cash flow.

Hi Ryan --- I am a co-host in Dallas, TX and use MTR strategy to maximize revenue for me and other investors.

If you use a DSCR loan you could maximize the equity you could take out while still breaking even on the mortgage + taxes + insurance.

The discrepancy between the monthly payment with 20% down and the monthly rents was mind boggling for me.Let me know what you would do to maximize wealth under these circumstances.  

Get out of your comfort zone.

Additionally, I would like to attempt to do the process Owner/Builder with subcontracting work out as well as doing some of the work I'm comfortable with (I have some experience with bathroom & kitchen remodeling an am not new to the construction industry).

The question is mostly a personal financial planning question and it depends on your preference and what balance of risk and access you'd like and would be comfortable with.