Dissaperaring admin bar and drasticcly lower number 1st pages on google

Hello. I noticed two things recently and I didn’t change anything in the settings. The first is that sometimes the admin bar from the top of the wordpress page disappears. It looks like its showing the cached page (old version of the page). And in fact sometimes when I refresh or press ctrl + f5 the admin bar comes back and shows the new version of page. But it’s not entirely clear what causes it.

The second thing is that the results of the first pages in google suddenly dropped from 100, in December 50, and today only 20. Could this be the result of a large number of articles and words on the page? I have about 400 of them and they are long. I didn’t change anything else. I thought my SEO was good. I don’t know if I can expect any help from you here, for example to check if an article is good for SEO, or maybe some settings are wrong. Thank you and good plugin.