What to do with cash flow ultimately has to align with your goals.

Depends on your goals and what you’re looking for!

Once you're ready, create a goal (e.g., "I will buy at least one single-family home, duplex, triplex, or fourplex before the end of 2019") and then do it.

The goal is to ensure that the property remains viable even if circumstances change, like dealing with a non-paying tenant or a market downturn.

The entire goal is to help you / individuals like you who are interested in a finding an agent who works with real estate investors.

You'll have to run them yourself according to your goals, timeline, and financial situation. 

For context, before I learned about his 6 unit I was planning to purchase a 2-3 unit long term rental in Q1 2025 as my first of many deals with a 5 year goal of financial freedom so I can coach my daughter's high school cross country and track teams.

To really give you good feedback on this, we’d need to know more about your goals and your current financial situation.

Once you're ready, create a goal (e.g., "I will buy at least one single-family home, duplex, triplex, or fourplex before the end of 2019") and then do it.

I agree with @Ashish Acharya if you're interested in reinvesting the proceeds into another investment property and your goal is to minimize your tax liability a 1031 would work out well for you.