Make Use of Two-Factor Authentication. Additionally, using two-factor authentication on any and all services that allow it means that you can ensure that nobody but you can access your accounts, even if they were to find out your details.
Use a Password Manager. Speaking of your details, a great way to further protect your information is to use a password manager, such as Bitwarden, to keep track of your passwords. This allows you to use different passwords for all of your services without losing track, which will make your accounts that much more secure.