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.
First way to level up is to complete tasks. each task will award you with 100 xp, sometimes even more! second way to level up is to chat on the forums. But, please try not to spam. Doing so will make you lose levels and possibly get your account banned. Third way is to make a thread. Again, spamming is not allowed. Also, try to put in as much information as you can. And that is it for good ways to level up.