Badges. Nothing else increases your level. Either complete tasks that raise the level of a badge, get the twice-a-year seasonal badges from the Points Shop, or start crafting as many badges as you can from trading cards.

Why do you need to level up fast?
Just enjoy steam

Buy games, craft badges, use your Steam Points during Sale Events like Summer Sale and Winter Sales. You can also buy badges on the Steam Marketplace to craft them.

The fastest way is to craft badges.

You can also:

• Complete the tasks for the Community Badge.
• Spend your Steam Points on the Seasonal Badge.

Here's the FAQ for Steam Levels and XP.

Originally posted by Carlos100:

Why do you need to level up fast?
Just enjoy steam

um i want to customize my profile

Fastest way is spending money.... Also almost the only way.

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3268851867