Taking risks can be a very terrible decision bit then taking calculated risks is more safer, now bitcoin investment is a calculated risk worth taking, it has a process and if followed accordingly would always yield profit in the future,
It's far better than investing on ponzi scheme or buying shitty coins that manipulated by their project owners.
Well, there's still time for anyone that's interested to buy and hold bitcoin it's never too late, although the prices have appreciated so well but it's not a problem since the new investors can DCA for a longer period and make lots of profits, if one can start holding bitcoin from now till like a decade or so then they won't even feel they missed investing when it was cheaper than now, the price of bitcoin would keep going higher, the signs are there so there's still lots of opportunities to make good profits with bitcoin.
This should only be considered to having possibilities of happening and nothing close to being certain to happen or guarantee and even if everything is done perfectly well and accordingly it doesn't still mean that it would always yield profits in the future yet I will still say that there is nothing wrong trying to do everything being followed accordingly by staying disciplined and focused through buying with your discretionary income and not selling too soon,
I agree with you about Bitcoin being more on the increasing side with the increasing adoption but don't still know what will happen in the future. That is why it would be extremely wrong to go all in on your Bitcoin investment because your future is not guaranteed, it is true that their is a higher probability of Bitcoin rising up to $1M or more but due to the fact that we live in a world full of uncertainty, going all in on your investment is dangerous because you might contemplate suicide if you invested what you can not afford to lose, but if you invest only what you can afford to lose, if your investment doesn't go as planned in the future, you would not be that shaken financially, but take note that no investment is risk free, including Bitcoin, it's as risky as every other investment out there, but the risk attached to it can be easily reduced to the bearest minimum if you can hold it for an extended period of time.