I see this play out constantly. Someone builds a niche app for their trade, drops a few videos, then wonders why there are zero subscribers. The usual advice is to hit Facebook groups and sell the problem, not the product. That's fine for awareness, but it's not going to get you a subscription from anyone who hasn't already decided they need the solution.
Here's the contrarian take: for a hyper-specific B2B app like an electrician's tool, your first users aren't going to come from content. They're going to come from direct relationships. Pick up the phone, call five electrician mates, offer a demo right there. Get one testimonial from someone who actually uses it, even if you have to give it away for free.
Stop optimising for views when you should be optimising for conversations. Content is for scaling an existing funnel. At zero subs, you need a lead generation strategy that doesn't rely on anyone finding you. Go sell, don't create.