Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
I think the game is fun for now, but I feel like it needs a way bigger questline and a combat update in order to get through the first games. Otherwise, games like ESO or BDO are superior because of their time existing which let them enlarge the questing space and make it better from a PVP point of view.