I think it's already time for us to stop selling dreams to those who are new in all this so that they can become long-term supporters and investors instead of getting disheartened and leave after one cycle or so. When we talk about Bitcoin multiplying its value over time, we should use the word "potentially", which means that it has the potential to reach a specific value in the distant future, but nothing is really guaranteed. You can't say that Bitcoin will do 15x or 10x within a decade or one and a half decades, because you don't know anything about the future, so you should say that it has great potential, which is why we should invest in it for the long run.
Those of us who are investing in Bitcoin in the current times should understand one thing, we are surely going to get good profits if we stay strong and keep holding without panicking, but we shouldn't expect richness from a single investment alone. You can't expect to become a millionaire after a decade if you are investing a few hundred dollars every month in Bitcoin, because Bitcoin will have to have a value in millions for that to happen, and it won't be realistic to have that high expectations.
I like your input because it hits on why a good expectation in form of wealth results on an investment in Bitcoin, needs quality investment effort, not just a small effort, but a big committed effort, both from how you purchase it, how much you purchase, to how you keep it, to how you invest in it with a consistent plan, to how you liquidate or diversify it to fit your scope.
Volatilities surely has a lot to do with the returns on Bitcoin investment and its seasons, and I can say that we can't predict the future but we can definitely have a good return if we hold Bitcoin for up to a decade with a steady and consistent DCA or lump sum strategy. There's also the ETF that's for large pocket holders and there's the part where setting up and running your own Bitcoin mining farm and node to mine Bitcoins too can make you reasonable wealth in due time.