Sell rental to purchase more?

[James Black]

I have a rental property that used to be a primary residence that I have been renting for 6 years. I could probably get between 460k-480k for the property and owe 309K. It has a CoCROI of 0.89% and a monthly cash flow of $100. 

I really want to start generating some monthly cash flow but am not sure if I should hold this property and get a hard money loan or sell it and use the "profits" to purchase more rentals. I have profits in quotes because I have approximately 270K in it (20% down payment + reno + mortgage payments for time I lived there).