Sites like GameFlip or Raise allow you to sell gift cards for cash (or other credit), which you can then use on Steam. 📱 The "App Store" Method (Best for Redeemed Credit)
Buy the currency on your phone using Google Play. how to buy steam gift card with google play
If the money is already in your Google Play balance, you have to get creative. Sites like GameFlip or Raise allow you to
If you want to try a specific marketplace, I can help you or check for current deals on Steam gift cards. how to buy steam gift card with google play