"Marketing is no longer about the stuff that you make, but about the stories you tell"
Seth Godin
Short vertical videos have nearly replaced other formats, and stories have become so popular that SMM-story makers have formed a separate segment. These are professionals who write stories for bloggers and companies.
Script development, filming, editing, game construction, music selection, and filters... are all typical tasks for a story maker. Believe me when I say that a 15-second video requires a lot of effort.
Consider using inbound story chains to enhance your sales if you have a business account. Also, if you're a Freelancer seeking a niche, take a deeper look at this interesting and in-demand direction.