When you can't sign in to your Google account, your first step is to re-enter your account information and password. If that doesn't work, you might worry because perhaps you're unable to access your email, calendar, photos, files, contacts and notes, as well as Android app purchases from the Google Play Store.
If you use a Google Workspace account for work, your next step is to contact your Google Workspace administrator. The admin should be able to help you reset your password and regain access to your account by signing in to the Admin console, going to Directory | Users, selecting the account from the list and choosing Reset Password.
If you use a standard Gmail account, you'll need to attempt the account recovery process yourself. To do this, gather as many devices you have used your Google account on as possible and go to a location where you have used these devices often. You're more likely to regain access to your account when you attempt recovery from an often used device in an often used location than if you try to sign in to your account on a device you've never used before in a new place. https://sites.google.com/view/gooogle-acccount-recoverry/home