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"The right moment" changes overtime, as historical evolution data absorbs your selling moment and then puts it into perspective further ahead. Assuming you are already in a winning position, selling now is likely fine from the ROI perspective, as you will probably have made some profit since the purchase. Nevertheless, a few months or years down the road, what seemed like a good sale at the time may result a mistake from an investment point of view. There is no way to foresee what BTC pricing may do, and especially when and during how long a reasonable "right moment" will crop up.
There’s a large psychological side to selling, as normally you’ll consider not just the selling price you settled for, but further more you’ll be performing hypothetical sales further ahead, simulating what the outcome would have been if you held back your initial sell decision a bit longer.
If you need to sell, and are making a win, then just do it and try to trim the future hypothetical fictional mental sales I mentioned. If not, holding for a while seems more exciting than selling at this point.
Having said that, BTC has gone down 500$ in just over the last hour …
