Where to Get Motion Graphics Demo Videos?

I've been using a homebrewed demo video for some time now (https://usegravity.app/web/video)

but would like to upgrade to something a bit slicker, like this: https://www.youtube.com/watch?v=9y927xiDtJo

Where is the best place to get one done? Had a look through Fiver but haven't found anyone who specialises in this kind of thing.