Why my website not working?

Hey, Hey everyone. I have been trying to set up a website with GitHub Pages and it did work when I first made it. try adding the /index.html it doesnt work, it just takes me to a github 404. help thank you

Website : yunus.github.io

:wave: Welcome!

That doesn’t appear to be a valid Pages site.

If you’re looking to use the standard user Pages site, then you need to use your own username. You would name your repository yunussk.github.io.

If you need help getting started, here’s some help for creating a Pages site.