You can post not only the above topics, but open up into different categories (personal, educational, entertaining, inspirational), but always question the relevance of the posts: will it be interesting for your audience to watch? Is the topic/idea relevant?
Abstract content can also work if the viewer has context about it, so it's good to bring people up to date and not just post random photos without explanation (unless it's for aesthetic purpose).
When your audience doesn't engage much with your posts, your content unfortunately gets shown to fewer people. To find out more about IG Algorithm and how it works - read
this article.