I don't care about leveling, especially into high level that doesn't give you anything much as a bonus. Selling cards is the only option, great profits, it will get you nice amount of money in wallet for more games. High leveling is only for rich and addicted people. I wish I could squeeze money out of rich people like this, they will basically throw money at anything that officially distinguishes them from others.
I upped my profile to lvl 13 by doing some badges for games I like, now I sell all remaining trading cards to buy new games when they come on sale. Having profile lvl more than 10 is a waste imo
in 3 steps
Choose the game that interests you and play itfor free.
Every game has some quests for which you will receive Soul Gems.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
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as far as i see there is a lot people in steam is hunt for steam level, badges, skins, and lot of other items, and there is a people who just came to steam only for buy and play a steam game for me, I choose play games,I dont care what is my level and badges, in the fact I never sold my trading card, but I have more interest in play game than collecting those items thing What about you ?