My Coverage is reducing

Hello in Google Search Console one of my website has this issue. The valid pages keeps reducing..

https://imgur.com/OTuWk0y

What kind of errors are you seeing?
Are your pages being de-indexed? (out of google serp)
Have you seen a drop in traffic?

Take a few of those URLs that were de-indexed, run them through inspect URL and click on 'request indexing' next to 'Page changed?' Do it even if the pages did not change. If they can't be index there should be a message why. For example, duplicate content, posts aren't mobile-friendly and so on. That should give you a good idea of what's wrong.

It will tell you underneath what the errors are just click on them individually and see what you need to do. I have been having this ongoing battle with the webmaster console for the last couple of weeks. I have 5 errors which I have sorted but it takes some time for google to crawl again. My biggest issues are in the mobile section with the text being too small for the screen etc and things to close together. Anyway just click the errors see what the issue is and then head over to youtube as someone will have made a video on how to sort it ;-))

I feel you need to seek a professional service in HAF someone will be able to fix it