This is fantastic advice.
I like to write about several topics that (mostly) fit together. If I focused on just the niche aspect, I’m breaking the rules. But if I look at whether I’m solving problems and trying to help people, I’m definitely trying and my feedback says I’m doing alright.
My point is niches can be a bit confusing to sort out and figure. Great guide for making sure you’re being consistent with your readers and what they show up expecting. But if you focus on solving problems, and that’s what your readers show up expecting, well that’s a game changer.