Hi there! I understand you're having trouble signing in because you want to use a different account associated with the same email address. Let's work through this step by step.

1. Single Email Limitation: Unfortunately, in Geometry Dash, it's not possible to create multiple accounts with the same email. If you try to create a new account using an email that's already associated with another account, you'll receive a message saying "Email is already in use"1.

2. Sign In Issues: Since you cannot create a new account with the email, you might want to try signing into the existing account associated with that email. Make sure you're entering the correct password.

3. Password Reset: If you've forgotten your password or cannot access your old account, you can try using the “Forgot Password” option on the login screen to reset it. This will send a password reset link to the email associated with the account.

4. Account Access Confirmation: Once you've reset your password, confirm that you are indeed accessing the account you expect. If not, take a moment to check for any typos in the email or password you entered.

5. Further Help: If you're still experiencing issues and cannot access your account, you might need to contact Geometry Dash support at [email protected] or [email protected] for further assistance.

Are there any specific steps you've already tried, or do you need help with resetting your password? Let me know, and I’d be happy to assist further!