Consistency is key. When people subscribe it's because they want to see more of that same type of video, so it's important that your content always fit the brand that you're building for yourself. It's also important to regularly upload content so people know when to come back to see more, so there's always something new for viewers to watch, and so'll get found more often in search.

Doing a mix of evergreen and tent-pole content is a good strategy too. You'll typically do best with videos that relate to topical events around when they're happening as well as ones that would be searched for any time.

I actually did some training with YouTube staff and got a couple lists of their top suggestions that I'd be happy to go over with you if you'd like to request a call!