You don't give nearly enough information for anyone here to be able to help you. It's like asking, "What should I have for dinner tonight," when nobody here knows anything about you, your food preferences or your options.
The most important piece of information you need to tell us is, "What are your goals?" This will have the greatest impact on the decision to sell or hold.
Next is, "What do the numbers look like if you hold this property as a rental vs what do they look like if you flip it?" Without knowing the numbers, both ideas could be good, both could be bad, or one could stand out as better than the other.
There's a ton of other information that would be helpful, but those two things are most important if you want informed opinions and advice...