Personally, I'd network with other providers before getting critical business advice from random strangers on the internet.
To address your specific point of counting the number of reviews as a measure of quantity and quality of potential clients .. that's a tough one. Public boards like this one have been hit hard by legislation, much of the better intel has migrated to private, invite-only channels.
Much like the days of yore, where retiring providers would sell their "little black books", there's probably a marketplace (like anything else) for clients lists, detailing tastes, frequency, average spend, etc).
When Twitter starting taking off in the 00's, I postulated on a now-defunct forum that it could be the best marketing tool ever invented for this sector .. it took only 15 years to prove me right.
I've also postulated that targeting gamblers is a great source .. guys with tons of disposable income, thrill seekers, DGAF attitude, etc .. I've heard from Vegas based ladies that their home market is so saturated that they need to tour when they need to make bank.
Lastly, check with ladies in Canada, where it's legal. Like any industry, there's professionals that develop industry-specific practices.
Good luck. You're ahead of the game, treating it like a regular service business.