TLDR; What's your budget? Are you going to learn/do you already have some photography/filming knowledge? Do you want to be able to colour correct and colour grade?
***
To be very frank, your phone's good enough.
There are also apps like Filmora Pro which can help you if you want different colour profiles (think log, flat) for your video, but they don't really matter if you don't want to colour correct (and if you want to do that, you'd have to consider getting editing software). Not really for the run-and-gun magician who just wants to shoot magic videos and post them online.
If you still want to spend some money and buy a camera, then photography or film-making subreddits/forums will be a much better place to discuss this. However, you'd have to be more exact with what you want your camera to be able to do and also, your budget. Every camera out there is ''really good'' now-a-day's.
Remember, if you want a non-phone-camera, then you'd need to understand the basics of photography and film-making. Because using such expensive cameras without knowing them, on auto-mode without a good grasp of the camera's capabilities, and without wanting to post-process a teensy bit (at least), you're actually better off with the camera on your smartphone. They have outrageous abilities, even the ones in a mid-price range. There are even short films being made with smartphones (though they use the smartphones of the really high price ranges)!