High number of excluded (not indexed) pages in Google Search Console

Hi. Today I checked GSC after a while and I noticed a very high number of excluded pages. Not only that, the number of valid pages was more or less constant, but then suddenly the number dropped significantly and the number of excluded pages rose significantly.

Please see the GSC report here: https://drive.google.com/file/d/1BSICPnmv8aIHv-AyJBliQiSXvyNLx2Jw/view?usp=sharing

I'm running an ecom shop on Shopify. The excluded pages are normal product pages.

Any idea what could be the issue?

Thanks.

Internal duplicate content maybe? Are they very thin pages with a high percentage of shared content? Try site liner

Thanks for the suggestion.

The "Crawled - currently not indexed" includes 18 pages - all my blog posts and pages like Terms of Service, Refunds, etc.

The "Discovered - currently not indexed" includes 51 pages and all those are product pages (50 word descriptions and product info).

Here's the Siteliner report: https://drive.google.com/file/d/1onGW1d1ZNzMIiFEDNTbJJ4Fot-9fUuw-/view?usp=sharing

Can this be fixed?