We never know, some people just really trust the future of bitcoin and they have big targets, I'll be happy if someone hold this long from the early stage but it's also right to at least sell a small stash just to enjoy the profit because it's not called profit unless you cash it out.
If I'm in OP's position, I might have not done it successfully, maybe during the 2017-2018 bull run, I might have sold a big portion of it, or even everything I have and then just try to accumulate again.
For many documentaries released about people who become rich for holding bitcoin over the years theb we can say that there are people who really believe the future, but we can also see people who just lucky ro forget about their holdings and been surprise that they have hidden wealth with their forgotten stored bitcoins so thia indicates that we can still do the same since bitcoins have brighter more furure and maybe in next decade we can see more of it and the price will reach at 6 digit so best to act to see a good result in future.
That is absolutely true, I always wish to be in that situation, even if not bitcoin, an altcoins with a huge value now and that could change my life. These people are lucky and smart, they are early believers, so they deserved for the huge reward.