error 404! We couldn't find that page

Dear Admin,
Please check mathsisland.cf
It show me 404! We couldn’t find that page.
What I need to do? How can I repair it?
Thank you!

Are you the same person as @Sateesh in the topic https://forum.infinityfree.com/discussion/3555/404-error ?

As stated in the other topic as well, if it says you need to wait 24, 48 or 72 hours, please wait the specified amount of time before assuming it’s broken. I can guarantee you: just wait and your website will start to work. Every DNS change (more or less) resets the timer, so by continuously tinkering with the account/domain links it will only take longer for your website to work.

sir/madam i was wrong in above comment
now i came to discover that Domain works with www, but not without how can i solve

my site is mathsisland.cf/

@SateeshPandey said:
sir/madam i was wrong in above comment
now i came to discover that Domain works with www, but not without how can i solve

my site is mathsisland.cf/

Again: DNS caching is the answer and patience is the solution.