A niche can be genuinely popular and still be full of people who will never buy anything. Gina Bell makes that split early. Interest and willingness to pay are two separate tests, and choosing a topic that passes only the first is how people end up with visitors and nothing else.
Her writing posts come at the same problem from the other side. She waves away the usual instruction about rewriting PLR and producing unique original content, then argues that a post with no passion inside it will not hold anybody no matter how correctly it has been assembled. Conversational writing, by her account, has three parts, and none of them concern formatting.
She works on what happens in your head as well. There is a method for spotting a limiting belief and taking it apart in three steps, a morning ritual pointed at goals you keep postponing, and a piece on the persistence effect, meaning the odd way results start arriving from directions you were not even working.
Go to the persistence piece when you have been busy for months and cannot point at what the effort bought, then take your niche back through her two tests.