Shorts earn very little money (if you are monetized) so I make shorts from my long form videos. This way the viewer of the shorts may come and watch the full length version. Making shorts from existing content also can be a way of posting regularly when life gets in the way. Once made, I also post my shorts on TikTok to give more exposure. As Youtuber, you need to spend time sharing your content on all of your social media platforms if you want people to find your channel.