Should I sell my newly built rental?

[Dai Nguyen]

Hello everyone, my first post and would like your thoughts. Been reading through some of the other posts, but here's my situation regarding wether or not to sell.

I bought a new build for 311k this year, it appraised for 340k a few months later before closing, and comps in the area are 400k+ selling now. My market is extremely hot where houses are selling the first day it's listed with bids of up to 30-50k on top of asking from multiple offers.

I put 20% down and I'm currently renting it out for $2700. Positive cash flow of roughly $800 a month. Now if I were to sell, I would definitely make my ROI at 100% but lose out on the monthly cash flow.

My initial thought was to buy and hold for a while, but didn't think the housing values would increase this much in this short of a time in my area.

From an investment perspective, would you sell or keep the rental? Granted if I sold, I'd have to sell a year later. 

How I see it is if I sell, I can put that towards possibly 2 other houses. Or continue to rent it out and have the house appreciate further while making monthly income.