I agree. Consult a Realtor in your area to analyze your options. There is a proverb that advises one to estimate the costs before building.
I think that applies here.
Tami is correct in stating only you can answer your question. Is there an immediate need to sell and re-purchase? Do you want to stay in the same location or are you relocating to a warmer climate or nearer to family? These type of questions can only be answered by you.
A good Realtor can give you market data from your city/town and your building. I'm offering this type of data to a couple relocating from Canada. Ask around for referrals. Interview a few Realtors - not all agents are Realtors in Manhattan. Make sure, if you do decide to sell that the Realtor will market your apartment to as many buyers as possible - ask them how they'll market your property; ask them if they co-broke, ask them if they'll guarantee their marketing services and ask what type of updates they'll provide you.
You'll need to let the Realtor know what your priorities are so a marketing plan can be tailor-made to your situation. Lastly, if you use the same Realtor to sell your home and purchase your new one, ask them if they'll give you a discount. It doesn't hurt to ask and it's not uncommon to receive the discount since they're going to be involved in two separate transactions for you.
Hope this helps. I can provide you referrals on stagers, painters, handy men, movers and lenders, if you need. The following web link is to my web page on my broker's site.