I would like to convert Story Map into PowerPoint, and I need help doing so.
There's not an automatic way to convert a Story Map to Powerpoint. You can print Story Map Journals and Story Map Cascades to PDF Files, but to create a Powerpoint you'd have to do quite a bit of manual work.
There is definitely a trend among Story Map authors to go the other way: to use story maps instead of Powerpoint to give presentations. My colleagues on the Story Maps team are doing that increasingly, especially using Story Map Series (for example, see "An Introduction To Story Maps" and "Storytelling for a Cause") and Story Map Cascade (for example, see "13 Ways to Make Your Story Map Sing", and "Why Tell Stories?)". It makes it easy to include live maps, scenes or apps in your presentation, and also gives you an interactive resource you can share with your audience.
Here's a blog post about how to add Powerpoint slides to a Story Map.
Here's a blog post about using a Story Map Series instead of Powerpoint, and that same article can also be found here in the most recent ArcWatch.
Hope that helps
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