You want to sit down and write something called an ICP, Ideal Customer Profile who you imagine would be the ideal customer for your product. This is the primary target.
Then you want to do another thing. Figure out how what you created is being used. It might not be anything which you planned. Once you figure out how your thing is being used figure out where the people who are using it are. Then go there.
[customer profile] has [problem] so I built [solution]
Then you should have an idea of who the product is for and then you can figure out where to find them. For example:
Boat owners who store their boats at home don't have a convenient way to move their trailers around so I built a motorized trailer puller that is controllable using a smartphone so they can move their boats without using their vehicle.
So I need to reach people who have boats on trailers. They are easy to find down at any boat ramp or marina. I could go down there and set up a prototype and show them how it works, get feedback, and maybe show them a QR code to join a mailing list. I could also go to boat shows, FB groups, subreddits, YouTube, etc.
Do you have a customer profile you could share, and maybe people can offer suggestions for how to reach them?