Best way to reinvest cash flow?

[Jesse Birdwell]

Hello all. New to bigger pockets. Pretty simple question, just looking for others ideas and opinions. In 2009 I bought a foreclosure, (my first), for around $65k, and lived in it as well as renting rooms to friends while we were in college. Upon moving I held the property and continued to rent it out. I cashflow roughly $350/month from the property and the mortgage is roughly half paid off. My question is how is this profit best used? Is it worth while to pay this extra cash onto the mortgage principal to payoff the debt off quickly? Stick cash in pocket? Reinvest into another rental property? Love to hear some ideas and opinions from others. Thanks for any help. 

Jesse