If your Gmail account is hacked and you have some videos on YouTube, then you can get your channel and Gmail back within 24 hours by taking the help from TeamYouTube.
It's not easy to recover the Gmail id directly, but the TeamYouTube is quite active on X (formyl known as Twitter). My Gmail was hacked on 14 June 2024. They changed my recovery email id, phone number and everything. They added 2-step verification and logged out from all logged in devices.
I tried all methods to recover my Gmail id, but there were no ways. Even I emailed to the Google support team, but there was no response. So, I finally put a tweet to the YouTube India and TeamYouTube responded on Twitter. After I following them, they send me a direct message and took another contact email id and they send me a link (personalized link) to fill some details. After filling all the details, they emailed (we can't use that email or can't reply to that email) me and within 10 hours, they send me a link to change the Gmail password. Quickly, I typed the password and confirmed the password by re-entering.
Boom... I got the Gmail id and logged in to my email and changed other details they had added. To get the YouTube account, it took a few hours, and everything is fine from then.