This is an unlisted video where you talk directly to your audience. You YT video remains on YouTube. These are typically "bonus & benefit" orientated and is sale orientated.
You inject them into the same automation you just created + the "inside automation" tag needs to be assigned. You inject them into the first promo email, the resend one because the "kickstarting" email was schedules outside automation.
You know that anyone who has clicked the link has seen your review page, which means they are interested. Use the "if link clicked" condition to separate them into a new series of emails where you share case studies and free bonuses to entice them to buy.
Go to the affiliate platforms and ask them for documentation about link tracking.