As another commenter below notes, a recommendation is to spend one second reviewing each card. Thus, your cards are generally quite simple. This can very easily lead to a patchwork of simple details, but no glue holding them together. I’ve come to believe that the mental effort it takes to understand something should be prioritised over memorisation. If you’re relatively busy and spending a lot of time doing Anki cards, you may be limiting your opportunities for this kind of challenge.