We want to see how high Bitcoin can reach for the last decade but let's just give an example of how much Bitcoin was a decade ago, so 2015 started the year with $200-$300 price and now look how much it is just in a decade.
Considering 2015 for speculating about 2035 makes sense but the price level seems misleading to me; otherwise I guess you need to consider the ATH by 2015. Because, bitcoin is known for dumping up to ~80% in a bearish year which means we may get into a complete different price range if we consider the prices at random dates.
although the multiplier should only get around 4.5x - 5x, might be not that much but with the expensive pricing, it will take time.
By considering the 2021's ATH was just 3x from the previous ATH, I guess smaller multiplier will be more realistic. At the same time, bitcoin's fundamentals are suggesting about logarithmic appreciations of price level against constantly shrinking supply given that new adaption rate variable. So, I guess 500k is not a big thing for a decade of time.