Rent by room / house hacking / co-living should deliver significantly higher cash flow than a traditional rental. 

DLP lending fund and DLP preferred credit fund = In solo 401k (roth or traditional) because they are tax inefficient.

I launched a coaching program aimed at real estate agents who want to transition from traditional transactions to building their own portfolios.

My goal is to learn as much as I can, connect with experienced investors, and start building my portfolio.I believe wholesaling offers a great opportunity to get my foot in the door without the large upfront capital required for traditional investments.

I will answer as it relates to traditional BRRRR, in the general case there are additional options.  1) Do not perform maximum cash extract.  

Stock market is traditionally much more volatile.

They can separate themselves from traditional real estate investors by building a robust EIN Corporate Credit ("Ever-Increasing") investment infrastructure that allows for faster portfolio expansion and more sophisticated financial maneuvering.

The more traditional way, assuming you actually have adequate equity in your rental, is to take out a HELOC on the rental. 

Buying a mobile home to place on your land can be a great way to generate rental income, but like any investment, it comes with pros, cons, and key considerations.On the pro side, mobile homes are typically more affordable than traditional single-family homes, meaning lower upfront costs.

serious buyers but also the property may not qualify for traditional financing.