Blog De-indexing Issue Fix Post Google Update

My blog has been severely affected by a Google Core Update. All articles on the site have been de-indexed, and new content isn't being indexed either. To make matters worse, I've recently removed some articles and made content changes, which may have contributed to the issue. I need an experienced SEO specialist who can help diagnose the problem and get my blog back on Google's radar.

Key requirements:
- Proven experience dealing with Google Core Updates
- Strong SEO skills and understanding of Google's indexing process
- Ability to diagnose and fix complex issues
- Experience with blogs specifically

Please only apply if you have the relevant experience.