Study all strategies, markets, etc, and find what fits your strategies.

I am not an attorney but I have studied this a bit so take it all for what it is worth.

I bought all of my properties remotely, following Nate's strategy. can you post the two fix and flips you completed and the case studies on the rentals.

If you study the economics of this industry, you'll see that it's very much like a sports team.  1% makes most of the money, then a small 2nd tier of agents do some transactions and a majority of the rest do nothing. 

Study the market.

things missing in your list (everyone manages differently, so take it with a grain of salt)Vacancy rateTurn overbad debt legal fees (evictions as needed)accounting fees for professional tax prepmaintenanceProperty TaxesSales Tax on PM fees (In NM, this is charged, not sure about where you are)Reserves for replacement CAPEX - furnace, water heaters, ac, roof, parking lot, etc.Admin, software, advertising, etc.Cost segregation study for accelerated depreciation captureAs for your loan. 

Cheers,Bill I am curious as blockchain has been talked about for a decade, can anyone share a case study / example where it has been made into an enterprise model and used successfully?

If there is still money left, I would set it in an account and study here on Bigger Pockets and get and education in stocks, options (i love options), notes and real estate.  

Quote from @Joshua Wei: Can anyone recommend a company in or around Birmingham, Alabama that performs cost segregation studies for single-family homes?

I studied abroud in Barcelona a couple of years ago - that place is beautiful!