@rawda Check the Publish directory in your Build Configuration.
https://docs.netlify.com/configure-builds/overview/
It looks like it’s configured to deploy the frontend directory:
https://myestate1.netlify.app/readme.md
https://myestate1.netlify.app/next.config.mjs
https://myestate1.netlify.app/src/middleware.js
When confused you can always see what you deployed with the Deploy File Browser:
https://answers.netlify.com/t/new-feature-browse-files-in-your-deploy-with-the-deploy-file-browser/105196
The general ‘File Not Found’ Support Guide is here:
https://answers.netlify.com/t/support-guide-i-ve-deployed-my-site-but-i-still-see-page-not-found/125