I would first recognize who your customer is. You can draw some inferences from who you've gotten interest from. I would then recognize what drives your customer. You probably have a profile on that, too. I would then recognize that your customers are not purchasing your services on impulse - it's a process with a commitment that demands deliberation.
So the trick is to get them to notice you, notice that your services fit within their overall worldview and life plan, and then educate them about the choices they're making, what they're getting for their money, and who they're entering into a long-term relationship with. I'm certain you can start that process with a Facebook ad. I'm skeptical you can finish it.
My wife created a binder of handouts for her clients. It was just a thing she did; it's over 100 pages and her clients love it. I pointed out that it was dumb for this thing that the clients clearly go apeshit over be withheld from them until they've signed; they don't even know about it until they're clients. So we pruned it of the stuff that needs medical advice, the stuff that you should do only under supervision of care, and the stuff my wife wasn't comfortable giving to people she didn't know and it still ended up like 40 pages. That's our giveaway in exchange for signing up for the mailing list, which we use sparingly (like four times, I think, so far). But it invests them in my wife's way of thinking, in the process of what they're hiring her for, in a bunch of stuff they haven't thought about.
My wife takes insurance. That means the out-of-pocket most of her clients pay is orders of magnitude less than the out-of-pocket your clients pay. We're also done with them after a year tops - at least, until they have another kid. You? They're banking with you for an indefinite period into the future.
Your trick is to (1) get known (2) get trusted (3) get desired in that order and I think that doesn't happen without a formidable expenditure in education and outreach. You are, effectively, creating a market segment out of thin air.
There's a reason Lance Armstrong built Livestrong. There's a reason Gwynneth Paltrow built Goop. That's all affiliate link bullshit but it's a brand identity that you trust to tell you how to do good things. I'm not saying you need to become a longevity hub but you need to grab techies interested in artificial longevity and hold their attention several thousands of dollars worth and that's gonna take some copywriting and PR.
And it can for damn sure start with Facebook ads.