How would I go about selling a smartphone game account (that isnt for Pokemon Go)?

I've been searching for places to do that, found a few that either only have PC MMOs and Pokemon Go, or only have a few smartphone games, or that have strange restrictions (like you can only sell for on-site credits and you cant cash them in for real money unless you're a premium subscriber).

I really just want to sell these two accounts and move on with my life, any place to do that (or any better suited subreddit to ask this question on)?