The best time for buying is at low price and I think if you sell your coins with profit then you should not regret after Fluctuations in coin price because you have already taken your profit so ready to make another step instead of regret about past.
If you are in doubt about other coin then just buy bitcoin now and don't sell until you achieved your target. This time is not suitable for selling but if someone is in huge profit and he cannot hold longer then selling should be preferred. Understand the market and accept your profit but I think if someone is selling their bitcoin without waiting more so he will miss the opportunity of having huge profit in Bull season.
for me the time you buy doesn't really matters but when you sell, if you have a plan of selling when the value is higher then no matter what you spent during your purchase you are sure of making some profit because you already have a plan and you are committed to this plan not minding what the prevailing circumstances are, and then when it is convenient for you then you carryout your transactions, perhaps this is where the long term approach comes in.
I think Everytime you choose to start your investment is quite different from when you’ve gotten to your level of over accumulation, whenever you want to buy bitcoin is always okay considering that you can always accumulate with DCA comfortably, everytime presents it’s opportunity in a different way that we can always think of buying more and accumulate more with a different approach of our cash flow and discretionary amount that we have available.
When I have gotten to my over accumulation and probably I must have been holding for two circle or one circle minimum, because there are people who even holding for one circle they still end up not stacking enough bitcoin into their portfolio and they will tend to have a different choice of holding for another circle and if you have this approach I think their is every tendency that before we get to 2 circle we must have had enough profit in our bitcoin portfolio that we wouldn’t have to worry about whatever the situation of market might be, there is difference between holding for a short term and holding for a longer term, and that is consistency and patience.