You can build an app in an afternoon now. That's genuinely amazing. It still doesn't tell you who needs it or what problem it solves.
Eterna Clarity's founder, Jesse Gamble, could have launched Xyterna a month earlier. The core was there, but a lot around it wasn't, so he held it back, changed direction, and launched later.
Ship fast. Put something small in front of people and learn from it. Just don't confuse building something quickly with building something people want.