How do you reach people with a new product that didn't exist before? Or a Service?

What has been will be again, what has been done will be done again; there is nothing new under the sun. Is there anything of which one can say, “Look! This is something new"? It was here already, long ago; it was here before our time. No one remembers the former generations, and even those yet to come will not be remembered by those who follow them.

—Ecclesiastes 1:9-10, New International Version

EDIT: I'm not a Christian and I'm not trying to convert anyone to my faith (or lack thereof), I just think it's a neat quote.

My point really is that you can generally talk about your products in some existing forum with reference to existing things. For example, if I wanted people to listen to my music, which ~~I have deluded myself into thinking~~ is a unique, previously unheard-of blend of genres, I would post links onto music forums and groups who are interested in recommendations of music adjacent to the type I produce. And that is how I actually spread my music on Reddit (although not as PM_ME_VINTAGE_30S) back when it was fresh. No ads, no wasting people's time and internet. I only reached people who already expressed their interest to receive music like mine. I got a very small following, but I achieved my goal.

Nothing is so unique that it belongs in no forum or is of interest to no existing community, yet simultaneously needs to be broadcast to the entire world. I have no problem with people sending me stuff they believe in to my email or other inbox, blow it up for all I care, but what I do take issue with is shoving that stuff into my web browsing experience or even sandwiched into the content I'm trying to watch.