I suggest making a price and profit plan before buying a crypto asset. when the target is reached, then actually it is your best time to sell your altcoin.
the market is now not moving together, we see some movements that only occur in a few assets because of an update made by the developer not because of market movements or the season of altcoin.
Usually a person before making a sale first they already know when to invest or when to get out of the investment, as is the case now where people who should hold do not sell but keep going down because they already have other predictions