When suddenly website losing organic traffic there are so many factors affects like as-
- Google Search Console Updates
- Google Algorithm Changes
- Links Lose (Low-quality link building)
- Site Redesign and Migration Issues
- The Quality of the Webpage Content
May be your blog doesn’t have quality content. because the latest google algorithm update will identify and rank the website according to the quality of content on the website. so if it doesn’t have quality content, rank goes down, which results in a decrease in traffic.