In a future where BTC is the main currency, how much will I have to have to be part of the .1%?

Recently read the frase: “if you dont buy BTC smiling now, in the future you will buy satoshis crying” and it made me think, so assuming BTC dominates the market when fisical money disappears and its vallue goes sky rocketing, how many should I have to be part of the 0.1% most rich, assuming we only have 21 million coins?