It is hard to produce enough content for your Instagram story, so that you post on a daily basis.
I find this strategy by Gary Vaynerchuk very useful to accomplish this goal:
Document, Don't Create
The main idea is to document your journey instead of having the pressure to create something new and creative every day. In the video below Gary explains his strategy:
This is the corresponding blog post:
Another good strategy is Gary's content model:
His team uses his talks at conferences to create micro content from it for platforms like Instagram stories.