It is a simply calculation and many things are changing. Things in 2017 to 2020 will be different than in 2021 to 2024.

Combine your simple math with chart, I think price from $13,000 to $21,000 are safe to buy dips. I know $13,000 and $21,000 are very different in price but that range is a safe zone to accumulate Bitcoin if for whatever reasons, Bitcoin dives like that.

$20,000 is a very strong support but I know it can be broken.