The price is volatile in the short term (6mo-2yr), but is very predictable in the long term (5yr-10yr). If you keep increasing the supply of something (USD) against a fixed supply of something else, the price of that other thing will always go up over the long term.
Discussion
It won't always, it depends on demand.
That's why it's very possible, that these 5y-10y numerology cycles will break down at some point. In Bitcoin, demand is more important than supply - and miniscule supply changes (halving) is what drives these astrological cycles.
I would definitely not bet on long term predictability. We need to be more humble, we don't know what the future demand will be.