There are small exchanges and lots of them and they usually turn to something else at the end,  maybe because they can’t keep up with the competition or they can’t afford the cost of running and maintaining the exchange. So instead of looking for smaller exchanges to list your coins,  it is best to look for bigger exchanges cause they are what people makes use of these days. Smaller exchanges don’t really have a lot users. As a newbie I wasn’t even making use of any small exchange, I started with Coinbase .