I think the trouble is that most exchanges want you to pay to get listed. See

http://uk.businessinsider.com/cryptocurrency-exchanges-listing-tokens-cost-fees-ico-2018-3

Cryptocurrency exchanges are charging between $50,000 and $1 million to list initial coin offerings, according to a Business Insider investigation

Back in 2016 when bitcoin's price was low, it was easier to get listed. Now it costs an arm and a leg, unless you have such big volumes that exchanges list for free because they want a piece of the trading action.