As you said diversification is good as you actually don’t know which of these shitcoins will pump up but one thing I will say is avoid diversifying and simply just invest into high conviction coins with good utility and once you see profits then I will simply advice to just take out capital and some profits and then keep moon bag just as you have said it is most certainly not good holding Altcoins for long
Most of them are just a momentary hype in the first week or first month and after that massive selling is done by the owners themselves. finally we are the victims of their liquidation.
I agree with the idea, if you see gains in the coin as soon as possible we should move it to assets that have fundamentals that we believe are safe as you said above.
Utility outplays hype in the long run. So that's the case - if you want to hold a new token or a coin, one should understand its potential for their appropriate community (at least), only then the decision can be made regarding the targets on it.