Site Visibility Issue on Bing/Yahoo

My website, winningdaily.com, has suddenly disappeared from Bing and Yahoo search results, despite having been visible just a few days ago. I recently made changes to the site's structure and updated some meta tags, but I have verified that all changes comply with search engine guidelines.

I'm looking for an expert in SEO and site visibility issues to investigate the problem and provide a solution. Please include in your proposal your experience with similar issues and your suggested approach to resolving this problem.