Thanks for reaching out. Have you tried following these steps to regain access to your account: https://yt.be/help/nr5L ? We recommend doing this from a known device and/or browser that was typically used to access the account. Here are more tips: https://yt.be/help/KyrL
Glad this was caught in time! Make sure to change your password and enable 2SV for enhanced account security. We also suggest adding extra layers of security to your account with these tips: https://yt.be/help/75ra