You could refi your 50% equity property to pull out more cash and use that and the $200k to buy more rentals or to invest as you like (Crowdfund, syndication, stock market, oil, metals, start ups, etc).

According to Corelogic , almost half of top US housing markets are 'overvalued"---At the end of July, of the top 50 markets, based on housing stock, 46 percent were overvalued, according to CoreLogic.

I buy the holders that stock 3 rolls below the one that's being used.

I've made more money since 2010 with a small amount of money and using leverage than that money would have ever made in the stock market, even over 40 years. 

As a retirement plan, the Solo 401(k) is vastly superior, with significantly higher contribution capacity, the ability to make Roth contributions of up to $18K per year with no income limitations, etc.Depending on your ability to contribute, and therefore how quickly you can amass some working capital, you may choose to start with a fully self-directed Solo 401(k) or you may choose to establish a low-cost brokerage Solo 401(k) that would be limited to investing in stocks, funds, etc. for the near term.  

I am 62 and swing trade stocks/ETFs for a living but would like to add real estate to my income stream.

There was one stock that announced they are a crypto company and the stock surged 2600 percent in a week !

I am using stock plans from Stockon Design (link below), but will likely have a draftsman make some minor changes.

But I find that HD doesn't stock the 12MM.

I, too, want my retirement nest egg to grow faster than afforded by stocks & mutual funds.