Here are some steps to help you clear out old emails to free up space in your inbox:

1. Manual Cleanup. Regularly review your emails, delete old and unwanted messages, and use Archive or Move to store emails in more appropriate folders.
2. Set a Limit for Email Retention. You can set specific limits for storing emails in certain folders.
3. Run Email Rules on Your Inbox. Create mail rules or filters to move emails from specific senders to a different folder.
4. Archive Emails. Create an archive of old emails to store away and make room in your inbox.