Pricing below market and starting a bidding war is a common strategy in the most desirable areas of the SF Bay Area, Los Angeles, and San Diego. If you are in a similar area, that's probably the way to go. Your agent calls the three parties and tells them to submit highest and best by tomorrow evening. Anyone else that calls to place an offer is told there are three bidders and to submit highest and best by the same deadline.
Once you have all the offers in hand, you can review them for conditions. Are they cash or financed? Is the buyer waiving the appraisal contingency? Are any of the offers "as is?" If none of the offers is what you want, counter the strongest offer with what you want and tell the others you are doing that, but if negotiations fail, you will reopen the listing for offers.
Unless the buyers all think the listing is overpriced and no one will bid higher, they will likely up the ante if they really like your unit.
No one really knows what will happen to real estate prices in the next few years. If you can put the equity to better use in your new home or in some other investment, sell and be done with it.