How To Transfer Youtube Subscriptions From One Account To Another -
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After 7 days, log back into the menu using either account. : After 7 days, log back into the
Download the .zip file to your computer. Extract it. Inside, navigate to: Takeout/YouTube/user data/ : After 7 days
When you subscribe to a channel on a new account, YouTube treats it as a brand new subscriber. You will need to re-enable (All / Personalized / None) for each channel. There is no way to transfer notification settings. no method is perfect
Ultimately, no method is perfect, and you should always back up your critical data before attempting any transfer. Choose the method that aligns with your comfort level and needs. Good luck!