Your channel starts showing up in discovery when the system begins to trust you and what you are publishing. The threshold for this is now set to 30 followers of your channel. When the followers of your channel cross 30, your channel automatically starts showing up in the discover tab. If you’d want an exception to this rule, do get in touch with us. We make exceptions for people who are already well known in their respective fields or provide an exceptional service that would make the world a better place (no kidding).