How do i level up?

Read this please, stop spamming the forum.
https://www.steamgifts.com/about/faq

read the faq, don't give out a game you received, you must activate them

You must make your way to the castle of Valve, killing all the scambots in your path. Then search for the elusive steam support staff and put her out of her misery. Finally, you must defeat the archboss Gaben and free the princess Half-Life3