is this intended as a comic? i'm a little confused by your intentions to post it on tiktok, to be honest! i was under the impression that only video content was allowed on that platform. also, by short chapters do you mean that it's a short story with several short parts, or a long story but released in many different short chapters?
could you please give out more details on the story, such as a general synopsis and what kind of horror you are going for? i agree with redlenai here- there are a lot of different subgenres and types of horror that different artists are more suitable for, so knowing what exactly you have in mind could be very helpful!