how correctly configured firewall , is any steps

If your blog post shows a 404 error in Google's cache after being crawled, it could be due to temporary server issues, an incorrect URL, blocking by robots.txt or meta ta...

Do you have some results?

Correctly configured firewall doesn't affect SEO or rankings.

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If possible, please provide the URL of the blog.

You can appeal for the wrong decision made. Check here, https://support.google.com/legal-help-center/answer/13965229?hl=en

While it is a positive thing to have low spam score, it has nothing to do (directly) with your ranking positions. So I wouldn't be looking for a relationship there. Also,...

The reducing traffic must be due to some other factors and not due to spam score. It must be investigated.

Well, sounds like error 404 occurred at the time of crawl. I'd check you web server error log for the day.