Hover over the notification and click on "1 pending trade offer
Go down and click "Respond to Offer"
Check the green box "Ready to trade"
Click the green button "Accept Trade"
Hover the mouse over your steam account click on "BADGES"
Click button "Ready" on the right
Click the "Craft Badge" on the right,craft all badges you get
By completing the above steps, you can successfully upgrade your steam level.
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