maybe the age range of the children you are trying to reach (3-4 year olds).
My daughter occasionally watches youtube (limited capacity obvs!), and she loves Cocomelon, which is animated, but is much more nursery rhymes etc. So nowhere near as educational as the stuff your lady wife is producing.
maybe the word education or learning might help too.
I am unsure of how youtube works with regards to what pops up when you search. i sometimes see hashtags under videos, maybe to help with this?
Appears the views are increasing with each vid. I think with a lot of this its all about perseverance and banging out so many vids that you get noticed. No easy task!
I will endeavour to show my 3 year old and see if she likes and engages with it.
good luck with it, as in theory, this is exactly the sort of stuff home schooling parents need right now.