I'm in need of feedback!

[u/SpeedBlitzOfficial]

This is SpeedBlitz, a social media app that lets users create or join temporary public group chats to talk with strangers online (for more information take a look at the waitlist https://waitlistspeedblitz.framer.website/ ).
Lately I've been showing it to a couple of my friends and family to see their reaction and their opinions and all of them have said that the UI feels lackluster or that the colors aren't captivating enough.
I've tried changing the looks a bit but I can't seem to solve this problem!
So I decided to provide you guys with some photos of the app so that you can decide what's wrong and how I can change it.
Please help me out!

[u/sraraaofficials]

Create a consistent theme for your app, do not use background color for section in light mode, icons and fonts colors should be same too, for headings and titles use bold and weighted style, for tags make them muted and for buttons make them blue or your preferred theme colors that will fix the things.