Even if bitcoin is amongst the best, if not the best of investments, profits are not guaranteed in bitcoin, even if a long holding period can be achieved.
Sure, the longer period of time has an upward trend, despite shorter periods of high volatility, yet bitcoin's long term trend is also not guaranteed to continue to happen... and there are also execution risks too that can screw up any individual investor. It is misleading to suggest that bitcoin profits are guaranteed, even if bitcoin is amongst the best, if not the best, place to put value for a broad spectrum of the world's population, as long as they have a discretionary income.
It should be known by everyone that, despite the long-term holding, profits in Bitcoin are not fully guaranteed. With that point, I believe people will not be as greedy and invest outside their discretionary income. As far as someone is using their discretionary income to accumulate Bitcoin from time to time, they will not have any problems with Bitcoin investment, and they will not regret it. Even if it takes a few years for such person never seen profit from it Bitcoin investment,despite the fact that Bitcoin profits are not guaranteed, it is still seen as one of the best investments based on the growth Bitcoin has experienced in recent years.
Yes you are right concerning the fact that there’s no guarantee that bitcoin will continue to go down or up too . But base on past performance bitcoin has proven to be among the best investments so far , which as even made some folk to regret not taken action earlier.
So using discretionary is a smart move tbh , it will help you to keep track while managing your normal daily expenses, making use of dcaing strategy . So still I believe if one start investing now he or she will still end up with some good profit at the end.