reply to zk developer at https://reddit.com/r/Zettelkasten/comments/1qiwfp0/im_researching_why_zettelkasten_fails_for_a_lot/
Before you do this sort of user research, have you done the research on the dozens and dozens of apps that are already out there (prior art)? What do you think is good about them? Bad? Why are some doing well and others not?
You realize that at once a week since 2019, at least one app a week pops up in the zettelkasten, note taking, productivity/GTD space? Very, very few pass the 6 week mark, let alone the 6 month mark. Why do you want to reinvent the wheel? What are you hoping to get out of it?
Are you self-dogfooding/eating your own cooking? If you're not using and enjoying your own app, why would others?
Simply reading through this sub will give you most of the research and friction points you could want to know about without impinging on our time for something that I'd be willing to bet won't even reach alpha.