But if you are just getting started right now, then maybe you first shoot for 1 million sats, and then you shoot for 5 million sats and then you shoot for 10 million sats and then for 21 million sats, etc, etc.
First start is most challenging because you have to overcome your doubt about Bitcoin, hesitation to start your investment journey with Bitcoin because of risk, and after you debut you will feel better with later purchasing times.
Dollar Cost Averaging is a most helpful investment strategy for investors, and by this strategy application, they won't spend all capital for a first purchase and they will have later purchases. They can increase capital invested in 2nd, 3rd, 4th purchases but soon they will come to time of cooling down and can not increase capital for a purchase round forever.
The importance for their investment success is, if they can DCA, hold bitcoin, and store their bitcoin safely, they can have more satoshis and can get rich.