Well, it appears that you've landed in my den of rambles.
oh-no.ooo! Uhm, I mean... Welcome to my website!
What you can find here
Fixing Disqus 'Auto' theme switching when using Next.js + next-themes
So, you want to have both a light and dark theme in your Next.js website, but your Disqus embed doesn't seem to change its theme accordingly... Maybe this will help!