how do I level up?

Seeing as you are new here, welcome to SG.

If you haven't already, please read the ToS, FAQ and Guidelines of this site to avoid rookie mistakes.

A few interesting links for new user:
https://www.steamgifts.com/discussions/announcements
https://www.steamgifts.com/discussion/XaCbA/list-of-all-cv-levels-and-their-corresponding-real-cv
https://www.steamgifts.com/discussion/GeDfy/failure-to-activate-and-regifting
https://www.steamgifts.com/discussion/z5iPh/psa-make-sure-the-game-you-receive-is-the-one-promised-to-you
https://www.steamgifts.com/discussion/Ov1oC/hll-hot-links-by-level-copies-and-region-restricted-added-useful-search-tool
https://www.steamgifts.com/discussion/1kgzB/new-search-parameters
Comment formatting

Perform a blood sacrifice to the SG gods

You can hide giveaways above your level in settings.

More dollar amount worth of games given out, the higher level you reach.

Be aware that some games have reduced value as they've been given away for free, or are ridiculously priced. i.e. $50 game that is just basic game maker assets pasted around the beginnings of an idea.

https://www.steamgifts.com/discussions/subscribed/search?q=how%20do%20I%20level%20up%3F

Wait for the next Blood Moon, do the ritual Ethiopian Shim Sham Sand Dance and sacrifice a virgin (Lugum will do) on the alter of RNG.