This is so exciting! LOVE your approach to developing personalized vocab themes. I can see that you're working on English only for now, but please know that I'm waiting in the wings for you to create the equivalent in French.
My first topics:
*All the vocab of every room in the house
*travel (including way-finding, documentation, planes, trains, and other *transport, speaking with a concierge, etc...)
I have a huge list to add to this of course, but that's a good start,