Markets to get involved with

So Gameflip has a lot of games it lets you sell in-game items for. However I haven’t a clue which ones I should get involved with and work to establish myself in. Last thing I want to do is spend time in a game that’ll has a dead market.

At the moment I am doing Fortnite which recently took a big hit due to a duping glitch. The market is starting to recover but will take time. Any suggestions of what else to try?

Rocket league