Disclaimer: just my personal opinion 🫣

I like overall design, the loading is not the best with my connection, perhaps you could optimize the images and the lazy loading.
Also maybe fonts are a bit too big.

1. is "plotting software" a known term? -- if not I would scrap your current tagline and headline with something more descriptive like:

"write stories in seconds
THE MOST POWERFUL CREATIVE WRITING APP"

1. I'd put the user reviews where the "multi-platform" section is

2. I'd amplify the problem/pain point a bit more , before introducing the "in short -- how to organize the mess in your head" section. Show the user what is the before and after they use the app.

3. Pricing section needs a clear CTA -- "Create Account" or "sign up now"

Nice design! Concise and clear.

Few things, ofc all subjective:
- use of "Software" word in your headline. sure, if it's a keyword that you possible customers are searching for (e.g. best plotting software) I guess it's fine to leave it there.
- not sure what "Advance Tools" imply. Maybe add a hover with details about it, or just split it into what the actual tools are
- maybe add the official logos for the "App Store" and "Google Play" in the top right menu (next to/instead of the text)
- not sure if "In short" it's needed. It's also clear without it what that section presents
- same for Multiplatform section: add logos to the actual app stores
- Logbook, Chat, Editor & reader roles - should have some short description or visual representations on what they actually do. At least for Logbook
- add that the annual subscription has an offer: 50$ instead of 60%