Thanks for reaching out. Have you tried regaining your access via Account Recovery: https://yt.be/help/nr5L ? It's best to do this from your own device that's typically used to access the account. More tips here to guide you through the process: https://yt.be/help/KyrL
I've tried account recovery multiple times and each time I get a "Google could not verify that this account belongs to you" message. I no longer have access to any of the devices I used to access the account.