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I think this is where we are before shifting from the point. There is no perfect time to take profits from your Bitcoin investment I think it's a personal decision but an investor holding for 8 years can take his investment as long the purpose is to do something useful with the process. What I have kept in mind is that there are people who invest to maximize profits while some invest to maximize the volume of Bitcoin they have. People who maximize profits when they reach a target are more propelled to sell than investors who want to see their Bitcoin holdings grow more and more.
The safer way is that if an investor has less Bitcoin in his portfolio, he/she should probably hold. Selling quickly should be the last thing that cross his mind, while an investor who owns more Bitcoin at least more than 1 BTC, he can choose to sell little based on the situation or the reason for taking profits. However, it all falls down to your investment goals as the genuine reason for taking profit.
Taking profits is really a personal decision, you said there is no perfect time to take profits i don’t intend to argue it but profit can not be taken when the market is down or unstable, when there is a downward trend i don’t think an investor can think of taking profit.
Maximizing your bitcoin will equally maximize your returns when everything goes well but for those who are not so concerned about their profits they are also more likely to suffer more loss when an unexpected downturn occurs so in as much as accumulation is important taking profits is also important as well to give purpose to your investment.
Actually I think there is no need emphasizing on profits taking for now because I think is too early to talk about it because without consistent accumulation there would not be any much profits to expect in the future, so right now I think the best thing is to focus on how to accumulate enough Bitcoin on your portfolio because that's the only way you can hope for a profits in the future, however we should also understand that even if we set a target of 8 years and above in regards to getting profits, you shouldn't be surprised that the 8 years will come and there will not be any tangible profits because of inconsistency on your Bitcoin investment, perhaps that's why we should remove our mindset from anything profits now because what matters now is our investment portfolio on how we can regularly accumulate and improve it.