Well it’s never a good idea to sell your entire stack but there are times when taking profit is essential. Altcoins still seem to follow the standard four year Bitcoin cycles which most of us are familiar with. Obviously the answer to your question is to sell when you are in profit. To maximise your profits though you should sell some in halving year and one year post halving, specifically the year post halving so that’s next year.
that way you can take advantage of the halving, and that is an effective way even though it does not always affects the price that occurs in the market, but of course it depends on demand that is done by taking advantage of the increase, but in reality it depends on your own research in the market and that can also determine the direction that is expected.