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Personally, I believe that you should figure out your BTC accumulation targets and then get to a point in which you might be building the size of your BTC stash prior to considering selling.. so if you have an investment timeline of 4-10 years or more, then you can figure out your selling strategies when the time comes and after you have built up the amount of your holdings in order that it might make sense to start to cash out portions of your holdings.
If you are figuring out when to sell, the you may well have not really figured out your balancing of allocations or even knowing why you are getting into bitcoin in the first place...
If you come into bitcoin, and you have no other assets then you might need to figure out some balance in assets and how much you want to have in bitcoin compared to other assets, but you would not have to figure that out in the beginning, especially if bitcoin is your only investment. If bitcoin is your only investment then you should figure out what your target investment building out amount is going to be and then work towards building to get to your target level whether it is a value of $10k, $20k or even $50k prior to then wanting to diversify into other assets (and I am not talking about diversifying into shitcoins, even though I understand some people will come to the conclusion that they "need" or "want" shitcoins in their investment portfolio).
Usually you will diversify into asset classes that differ.. such as property and equities.. but you likely need to build up to a certain target amount that only you can figure out prior to figuring out what you want your allocation to be in different kinds of investments.
If you already have an investment portfolio that includes various assets, then you might try to figure out what portion of that you would like to become bitcoin, whether it is low as 1% or as high as 25%, and then if you have a target allocation level that is compared to other investments that you have, then you would figure out how to reach your allocation whether to reallocate from other assets, or just to build your bitcoin portion with new cash as it comes in, and then you might be able to figure out an estimate of how long it might take you to reach your target allocation level (of let's say 10% that might take you 1 year or more to reach the target level). The more you play around with these ideas, the more you should be able to tailor your targets to your own personal circumstances that would include accounting for your cashflow, other investments, view of bitcoin as compared with other investments, timeline, risk tolerance, and time, skills and abilities to strategize, plan, research and learn along the way including tweaking strategies from time to time to consider trading, reallocating, use of leverage and/or financial instruments.
It can take a long time to figure out each of these, but you do not have to figure them all out before getting started investing in bitcoin.. and accordingly any person could start by investing small (or investing something that they believe is reasonable and prudent) - and continue to study their own circumstances, and perhaps tweak their investing strategy from time to time along the way.
it seems you are right, over time sometimes investment plans can change. And it looks like I really have to recalculate and adjust how much % I will invest in bitcoin. so far i'm just collecting bitcoins continuously without thinking how much i'm going to target. and adjusted again with the amount of other investments that I have. but for the target time frame I've decided for the long term around 3-5 years. and there may be adjustments or changes if something is urgent. such as global security conditions or global economic crisis and the like. well I hope over time I can understand it.
