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I like where your head is at! You will probably find it easier to grow a die-hard fan base if you’re more specific.
Like, if you’re totally dialed in on one outcome, like nutrition and lifestyle to reduce the risk of dementia, for example, you will find it easier to speak to your audience, figure out their most common problems and needs (cause they will be more similar than when speaking to a broader group about general aging), and then create products and/or services to help them.
If you’re not sure which direction to go in, maybe try doing some keyword research to see if any of your ideas have the most potential w. SEO.