Everything depends on the price at which you bought your bitcoin or a part of it. Based on that, the selling price should be higher than your entry price, in other words, buy low and sell high. It is necessary to have patience and an understanding that the price can go far down for a period of time, and that the next growth phase needs to be waited out. This may take more than one year, so you have to give yourself that time and avoid panicking.
Also, if you need the money and you need to cash out but you should at least be on the positive side already. Meaning you are already in profit. As much as possible, don't sell when you are at loss.You invested in this market for the mere thought of gaining some and not on the losing side.
So for me the right time to sell will be -
> if you badly need the money and need to cash out (personal needs or immediate family)
> if you already hit your target profit, already on the positive side
> you are about to invest other profitable assets and you need to sell some of your BTCs