Is it a blog style home page?

A lot of things changed for me too. My first places dropped a little and some others of my sites had great improvement...

Changes started happening in the beggining of October.

No changes or small, from #2 to 3 and back kind-of-changes.

Is your homepage displaying the latest blog post at the top?

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Google keeps my head spinning as well. It seems you get then figured out and there they go again mixing it up. Be good to hear others opinion!

Wtf! After that change, my top content page dropped from 1st to 4th position and now a couple of sites having shity links from directories only, are on top of me!

This is really weird. same here. My homepage ranked on 1st page for couple of keywords for few weeks and then ranking was dropped to 4th page. and today I cant find my homepage anywhere on the serp. There is no message about manual action taken against site. inner pages are indexed only homepage is missing.

Aside from algorithm updates that affects the SERPs try to analyze those competitor websites in which outranks your website. Otherwise your site is not performing well in the respective field.

Well, as an option it might happen when you put a number of backlinks pointing to your website that brought traffic and higher rankings, in a period of time Google has overestimated them and considered as spam some of them. As a results, the website is losing its' positions.

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Take a look at this site as it details all recent updates. https://www.rankranger.com/google-algorithm-updates

This is Google Dance Google will update your website and refresh the content for better SEO is in your favor.
Welcome to the world of "Google Dance". The Google Dance is simply that the predetermination of when the
actual update will commence.
Whenever your site’s rankings start dropping start looking for causes and solutions.