Maybe while your portfolio goes into a coast mode you can take advantage of growing personally or starting a new business. 

How to track potential growth in an area to see if a lot is viable for purchase and building spec homes on etc. 

While offering the “cash flow tranche” of a SFR might not be viable, the cash flow tranche of a portfolio of say triple net leased properties may be much more viable.  

Commercial Property Rental: How viable is investing in commercial spaces for steady income?

A HELOC or home equity loan on your personal home could be a viable option to fund the rehab, but it's always a good idea to chat with a lender to explore all your options and find the best fit for your situation.

While I started with arbitrage in 2016 I no longer find it to be a viable strategy, or at least it is finding a needle in a haystack.

Salaries, compensation, rent, taxes, utilities, fees, MLS, etc.The flat fee model is a recipe for disaster."

The nice thing about the arbitrage business model, is the companies usually pay you a monthly rent, and then they handle all of the AirBNB stuff. 

Worse case I just continue to manufacture them through my fix-n-flip business and buy with seller financing where available.Also, is tax lien investing really viable today? 

His model is the exact opposite of what most gurus teach.