I guess everyone will be happy if they can always have access to translate the alt-coin they hodl to cash.
So what exchange let us do that if the coin not listed? I guess hard to find!! if you lucky you get it forkdelta
If your coins are listed you hope for volume in a serious exchange like the top ones which has really high requirement before listing
which lots of coin fail to pass because it mostly likely not a well organized project
I use
www.huobimena.com for trading and also OTC deals
Telegram channel:
https://t.me/HBMENANever heard of it but for my unlisted coin I would always used forkdelta or etherdelta if it is a ERC20 token or coin,
But I also use different trading platform depending on what alt-coin I would trade.
We couldn't use single trading platform because for sure not all of our crypto would be listed there.