If you can sign in, secure your account by following the steps below:
Follow the instructions in the security check up: myaccount.google.com/security-checkup
If you think someone else is using your account, change your account password if you haven’t in Security Checkup. Change your password in apps and sites with the same password, those you have used your email for sign up, and those you have saved your password.
Check if your recovery email and number are correct so you stay informed about any unauthorized activity.
Secure your apps, contact your bank, install a more secure browser and remove harmful malware.