The smallest version is usually the right one
You don't need every feature on day one. Start with the smallest version real people can use, learn from it, then grow.
When founders tell me their idea, it's never small. It's the big dream. Every feature. Every type of user. Every "oh, and it could also do this." I love that energy. You want a founder who dreams big. But for the first build, it's a trap.
You don't need all of it to start. You need an MVP. (MVP just means "minimum viable product," the smallest version that real people can actually use.) One real use. For one real person. Done well. Everything else can wait.
I once worked with a founder who had a huge vision. Instead of building all of it at once, we broke it into phases and started with a simple MVP. The trick was that each phase ended with something people could actually use. So after every phase, we had time to test it, see what was working, and learn from real users before adding anything new. By the end, he wasn't guessing. He was building on top of things he already knew worked.
That's the real payoff of starting small. You learn faster, you spend less, and you find out sooner if the idea even works. So start with an MVP. You can always add more later.