$1 million in 4-5 years is one of the possible scenarios, yet each of us should be attempting to prepare ourselves both financially and psychologically for a variety of scenarios.

There were so many folks in 2016 and early 2017 who continued to think that the top of the 2017 run would be around $5k at most, yet in that year when the BTC price went up to $19,666, there were some folks who held through all of that and maybe only sold a few BTC at various points along the way up, but they still had plenty of bitcoin, even when the BTC price got into the $17ks and above... so then some of those guys just held through much of that whole period, even if they might have had gone from 3x to 5x to 10x to 19x and beyond in the level of the BTC profits on paper. 

So there can be some advantages in regards to being prepared even for scenarios that are way beyond your expectations and to have a general plan regarding how to treat such BTC price move situations if they were to play out.

My own style has been to have various points along the way that I sell, yet with me, I had already proclaimed to have had gotten to overaccumulation status in 2014-ish.. and I had never fallen out of such overaccumulation status, so even if I might have had been wrong in my assessment of my won overaccumlation status, the BTC price ongoingly going up in the last 10-ish years has largely just bolstered that overaccumulation status, so I have already outlined a tentative plan past $1 million and even past $10 million, yet I ONLY have concrete sell orders set up to about $500k.. since from my current perspective, it seems a bit unrealistic to set up my BTC sell orders beyond $500k.. even though if the BTC price starts to get close to $250k, I will likely have to reconsider the extent to which it might be practical for me to set sell orders up higher than $500k..