Short monologue by Nate Tilley (YouTube video) giving actionable advice on how to find clients in a niche: research the market to identify needs and values, and—most importantly—interview clients directly to learn why they bought, what they enjoyed, and what hesitations they had so you can craft compelling, low-friction offers.
There is always an angle. That's all I can tell you. Doesn't matter what the niche is that you're in, in any single market, there's always an avenue to go down. And the way that you find out that avenue is just by doing the research. What is my market really in need of? What is it they value? What are their questions? Obviously, there's no better way than actually just interviewing your clients and finding out directly from the horse's mouth, what is it that's important to them? Why did they buy it? What did they enjoy? What were their hesitations? And that in itself is going to give you the angles that you need to go in in order to justify the purchase and in order to make it a no brainer.
