On top of which, its exponential not geometric growth.
Into your calculation, you could try to extrapolate a "compounding" daily rate of growth and then, monthly, offset that by a step-down in value to account for the ordering & setup of monthly new hardware.... decrementing the cash generated & available by a regular, monthly % sized purchase of an steadily increasing hardware buy.
Just to be conservative, try .25% growth per day on average & see how that compounding rate looks in your spreadsheet. Then try .5% monthly, and .75% and so forth.
Bear in mind that bitcoin prices exploded over 40% since EOD Friday.
Imperial Whazoo
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