Personally im going to take profit when im think is enough especially when you already x2 from the initial investment.
But you can use strategy buy when dip and sell a portion when it high until it touches new all time high or your target
Altcoin like memecoin can easily make you rich in a couple of day or even hour but it very Risky
The kind of coin you hold determines when you are very okay to sell and when you think it's normal to exit. There are some coins in this bull run that when you trade them carefully, you can make that amount of profit in a day because that's how bull run are in crypto but there are some coins you will buy that you will be begging the conn to go back to where you bought it so you can exit the coin as quick as possible, you don't need the profits anymore but your money.
Altcoins used to be very good for holding but now, very unpredictable because they seems not to be too interested like before, even the hype isn't there like it used to be because when you lie many times that you are going to do this and that's and you fail to do that, a time will come when no one will be believed the ones that has good intentions, this is what altcoins made some people to feel regarding in investment and how they can patient about the project growth.