Hello Thanh Duy,
Here you are facing with two issues, Emotional and Economical. How much "dislike" are you with the current home? if you stay and stick it out for another few years until the market turn, would that be so terrible? and what is the picture of the bottom line if you sell the house, exactly how much you will loose and are there any other options?. Answer those questions then you should have a clearer answer.
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