How to know what step to take next to grow my portfolio?

[Hugo Flores]

I own a duplex which I house hack. This is was my first home purchase. I want to keep growing. Please please advise!!
The duplex was purchased newly built. Therefore, everything is pretty new and should hold with maintenance. I financed with FHA so PMI is also eating a bit of the profits. 

My question is since I did not buy a fixer upper nor built equity through renovations, what is my best way to go to grow my portfolio? Do I save money and do it all over. Do I pay off more to gain equity and refinance? Etc etc.

What would you do or recommend me do for my next purchase. I have a feeling I cant do much to take money out of this to use again.  
Also, property is in a very solicited area, which I am hoping for it to appraise and grow me equity. I know its something you cannot foresee but location and vacancy will not be an issue. 

All in it was 14k. I forgot to add to chart.