Congrats on a nice chunk of money in equity! Some of the thoughts that came to me are:
1.
We're pretty sure this is not where we want to be long-term.
Define long term. If long term == 2 years, then sell it. If long term == 10 years, then keep it. Even if the market has one more dip in the next 10 years, you will also see a market rise in the same period. So, no point in letting go of a nice equity and reduced stress that comes with it in a down market.
2.
Are there any plans to grow the family i.e. kids in the near term? If so, is this a good area for kids...schools, neighborhood, etc If so, hold onto the house.
3.
Why did the house rise in price? Is it because of some positive development in the area like a new factory, new tech park, etc If so, I would hold on in the hopes of more appreciation OR at the least buy you some time to make the decision without too much of a fall in price. If the rise in price seems to have no foundation, then it has as good a chance at going down...i.e. I would sell it and cash out.
4.
Is there a possibility of renting out a portion of the house? Say I put some money and convert one of the rooms to a rental. If that is possible, then it would make sense to downsize in-place and get some money to boot. When you need the extra space again, then you can reclaim the rental space. Rental income should offset any drop in equity and help payoff the mortgage as well.
Hope that helps.