It is always better you have a plan over your Bitcoin investment before you invested in it and always try to stick to the plans. Many people get confused because they don't initially have plans for their Bitcoin investment and that is what normally course their panicking whether they should sell or not. Always try to know where you always want to be taking your profit. Asking people to tell you when to sell is not a better idea because nobody is expert in that way, everybody is just saying is own base on their technical analysis views.(knowledge)
Your decision on whether to sell or wait until the price rises even further depends on you. But make an effort to take a seat, reflect, and conduct additional research. No one controls the market price, so it is difficult for anyone to advise whether to sell or not,although it not bull run era but nobody can 90% assure you maybe it will continue maintain the rang of $20k till bull run time or still fall beyond $15k.many people are only speaking about their own experiences.
This is the best have read here so far, is good for one to know that no one control the market, anything can happen, even when we pray for the best,be prepared for the worst. Holding is one challenge investors in bitcoin are facing, its hard to determine when to sell, because they're so many experts with their own experiences, that will discourage you not to sell, as if they control the market price. I think you made it clear that one should know when to withdraw his profits. Don't reply on any experts ideas to avoid lost.
There is a difference between trading and investment, taking your gains out of your investment periodically is not investment, but trading and it is okay if you want to be a trader and not an investor, but my only problem is that you and who you quoted are intertwining both and I discourage that. You need little or no technical analysis to be an investor
Investing is buying with some level of funds and leaving it until maturity which you can choose to continue investing without tampering with your funds, or take out your gains, reinvest your total capital, some part of the capital, or even increase your investment portfolio as the spirit leads. Every investment has guidelines which you must adhere to if you want your investment to be worthwhile. Bitcoin investment prides in allowing your investment stay for a long period of time. Periodic gain collection and altering of your investment is not part of bitcoin proper investment guideline.
If you are not leaving your portfolio for a long time, let's say 4-10 years before altering it, then you are not investing rightly as short-term investment activity is a wrong approach to proper bitcoin investment.