To sign in with another Google account, please follow these steps:

• Add the desired account to your device (Settings ➡️ Google ➡️ Account ➡️ Add new account).
• Remove the game from your device.
• Open Google Play in your browser and locate the game.
• Make sure that you are logged in with the correct Google account. You can verify this in the Account section on Google Play.
• Install the game on your device by selecting the "Install" button.
• Open the game and attempt to make the purchase again.

❗ You can also read the instructions for adding Google accounts in this article.