You can sell your tokens right before the dump to fix the profit. Or you can increase the number of tokens by buying them when their price is at the bottom point to increase the potential profit.
yes to get a profit, we can buy tokens when prices are cheap and can sell them at high prices.
and in my opinion if the token goes down we have to hold it and just wait until the price rises, because if we sell when the price drops, we will experience a loss, we recommend waiting for the price to rise again and then we sell to make a profit.