I followed you!
The link in your bio won’t be clickable until you have 1,000 followers (and even then you get just one link), so instead of posting those, I would suggest describing yourself with your genre (dark fantasy author?). That’s more likely to lead readers to you.
I like your trailers! They look professional, and I think the text speed is okay. But here are a couple of potential issues specific to this platform:
1. TikTok tends to favor videos made in its own app or in CapCut (which has cool effects that make photos look 3D, though I haven’t tried it myself). Some authors have success with Canva videos, but they say it’s preferable to add the text and music in TikTok itself.
2. TikTok has weirdly strict content rules designed to keep everything safe for 13+. So if it detects words such as “kill” and “murder” in a video, that video may be suppressed. This has given rise to people writing words with special characters (“k¡ll”) and inventing new words like “unalive.” (Yes, it’s ridiculous.) But that could be an issue with one of your trailers. I think that one also features a bloody sword, which TikTok also might take issue with. It doesn’t like images of weapons, though somehow a knife cutting vegetables is okay.

I’m not an expert on this—there may be safe ways for fantasy and cosplay fans to show swords without getting the video suppressed. I would search “sword” to see.
So, yeah. It’s a finicky platform, but some dark fantasy authors are having great success with it. I would suggest looking at A.P. Beswick’s account. His videos are incredibly simple, and they sell a ton of books. If I could replicate that success, I would!
Thank you so much, ElaineB! Now if only those videos would sell a few books for me…