This is completely an off topic and meanwhile this thread is not talking about selling which sounds more of trading and gambling, but accumulating Bitcoin and hodl for a long period of time for like 5-10 years and the best way you can do this is to set aside an amount of income after setting aside your reserve fund or an emergency fund then use to amount to buy Bitcoin by using the DCA strategy which will help you to buy at regular interval either weekly or monthly.
The extension shouldn't be limited within 10 years but also as a lifetime process, not just accumulating for 10 years only. The process is for us to look in a long run, DCAing, sticking to our investment plans also not over engaging the process but developing a system that makes you consistent in your accumulation phase. If we treat it this way, we won't get tired but keep investing in our digital gold.
Yups pretty much agree with your opinion, a period of 10 years is indeed quite long and maybe you or anyone can make a pretty maximum profit as a result of effort, hard work and maintaining consistency in the process that you have passed but that does not mean that after we complete the 10-year accumulation plan we no longer need money, because after all we will always need money to survive, which means not getting too hung up on the accumulation planning limit might be good enough to keep in mind, because the problem is that maybe you will also limit your mind to build further ideas or the point is that you only focus on planning for a period of 10 years.
Another thing is that I think having a plan for the accumulation that you want/will run is indeed a good approach (regardless of the timeframe) but I think this is just a plan, because after all it is a fact that we never know what will happen someday, or that means it is always possible for us to experience undesirable situations that can make us disrupt the accumulation plan that we have planned, For example, you are unexpectedly laid off from work which makes you experience a loss of income which of course the situation can make us experience a delay in the allocation for accumulation planning, meaning that I don't think it's bad to not focus too much on the planning period that you have set, or it means that you better think that while you can get involved in investing by applying good consistency to the DCA strategy as long as the situation is favorable then do it.