The aim is to reach as wide an audience as possible, then encourage them to move down a funnel until at some point you might get some income. It's important to decide on your main channel, so that other channels can be used to direct potential fans to it.
Look mum no computer uses YouTube as his main channel. Sam also posts on Instagram, Facebook and has a web site, all of which direct you to YouTube as well as doing their own thing.
- One of his videos may well show up on a casual YouTube viewer's feed, based on the mystery which is the YouTube algorithm.
- A subset of people watching this video will think "Who is this maniac? I love it!" and watch more of his videos.
- A subset of those will become subscribers.
- A subset of these will become engaged fans, comment on the videos and tell their mates.
- A subset of those fans will become Patreons.
There are other ways of getting your name out there, like Twitter, LinkedIn and a plethora of new sites like TikTok. Ultimately they all need to gently steer potential fans to your main channel, whatever that is.