BigCommerce Store Indexing Issue

I'm seeking an experienced SEO specialist to address an indexing issue with our BigCommerce store. Despite having around 200k pages, Google Search Console shows a significant drop in indexed pages, sometimes down to 56k, without any error messages or warnings. The products appear correctly during manual verification, and no recent changes have been made to the website structure or content. However, we do use several third-party plugins and apps that might be affecting the indexing process.

Key Requirements:
- Diagnose and resolve the indexing fluctuation issue
- Analyze the impact of third-party plugins and apps on indexing
- Ensure all product pages are properly indexed in Google Search Console
- Provide recommendations for maintaining consistent indexing

Ideal Skills and Experience:
- Expertise in SEO and Google Search Console
- Experience with BigCommerce platforms
- Ability to troubleshoot and optimize indexing issues
- Familiarity with managing third-party plugins and their impact on SEO

I look forward to working with a professional who can help stabilize our store's indexing and improve our visibility in search results.