Unfortunately, without an account link, it is not possible to restore players' accounts or game progress. Having a linked account is crucial to ensure ongoing access to your profile.
You can try all possible linking methods that you might previously use and make sure that you are logging in with the correct Gmail / Apple ID / CR account that you initially used.
If you played on a Guest account, unfortunately, we cannot do anything for you unless you previously bound it. All your data will disappear once you uninstall the app or log out of your account.