Almost every product idea arrives larger than it needs to be. The skill in the early stages is not adding features. It is deciding what can wait.
Small is not the same as poor
A first version is not a rough draft of the whole product. It is a complete, reliable answer to one specific problem for one specific kind of person. It can be narrow. It should not be flimsy.
Find the one job
Ask who the product is for and what single thing they are trying to get done. Then ask what the least they would need is in order to do it and come back. Everything else — settings, reports, integrations, the second and third type of user — goes on a list for later.
Why this works
A focused first version reaches real users sooner, which means real evidence sooner. People will use it in ways you did not expect and ignore things you were sure they wanted. That information is worth more than any amount of planning, and it is far cheaper to act on before the product is large.
What not to cut
Security, reliability and a clear way to get help. A small product that loses someone's data or lets the wrong person in will not get a second chance.
How to tell it is ready
Could a real user complete the one job from start to finish without help? Would they notice if it were taken away? If yes to both, launch it. Then listen, and build the next most valuable thing.