For those of us who are inseam challenged, this is a very relevant topic.
For data, check the occurrence over time data for "step-through," "mixtie," and other variations in Google search.
I agree with the prior comments on your personal increase in queries, e.g. aging ideal customer cohort, COVID, etc.
In addition, your brand awareness is growing, so you will also intersect more of that ideal customer's research.
I suggest an integrated downtube 21700 and a secondary 21700 pack in the mid-station of an ST-ish mid-tail frame.
That enables high amp-hour capacity and good low central mass.
The mid-station can be used for shopping and other cargo when you don't need the extra range.
Lots of "low barrier to entry" urban, trekking, touring, and expedition capabilities in that form factor.
Welcome to EBR ... thanks for posting.