Aman Trivedi
The very first step you can do is clear the old, unnecessary emails.
Make your important emails archive to keep them in a tidy and organized manner.
Remove mails with large attachments or files and make sure to keep them stored in Google drive or phone manager.
Always keep your trash empty permanently delete the emails and provide you some free space.
Stop subscribing to unnecessary sites or unsubscribe if already subscribed if you are receiving unnecessary emails.
Check and permanently delete the unnecessary attachments with large file sizes.
The last way is to spend some amount of money and subscribe to Google One for some extra storage with some additional benefits.