Jekyll theme is not loading

Hello, I am new to GitHub and make my page using the Jekyll, but one can see the theme is not working and neither the other pages are working. It is just redirecting to the GitHub home page. I tried to follow Page not showing the theme but unable to fix the problem. Can anyone please help me to fix the problem?

Thanks in advance.

I just checked your site, it says 404, so the GitHub Pages is not working, so meaning it is not only your theme, it’s the entire site.

If you can provide further details, maybe I can help you.