I shared with a couple of co-workers/friends and they all liked it, I then built a simple website with screenshots and a download button for free.

Then I started sharing the progress on LinkedIn/X, my co-workers shared on their network too which also helped.

After 4 months I put a price on it and sold it with a 50% discount for early adopters. A lot of people bought it, which to me was a signal that I was into something that could become bigger if I invested more time on it.