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Nobody will come to your new website if they don't know it's waiting for them.
Just keep in mind that if you plan to go to other niches you'll have to get additional domain names.
It's unlikely millennials in New York will be interested in a dating website called Utah Senior
If you're going after local singles, consider making fliers and putting them in the places where they are most likely to hang out.
Because a popular website is going to cost money to operate each month, if you want to keep your service free, you will have to find other ways to monetize it as it begins to grow.