I think that every meme coin must have any practical use. In such case the meme coins will be in demand for a long time and its price will increase.
Meme coins are created for funs but fun do not have any practical use and fun can not last for ever. That is why the price of meme coins rise too much and then the price of meme coins falls to much. And it is necessary to be ready for this fall.
If you will only have fun you will not be able to earn much money but you will be able to lose a lot of money. If you want to earn money it is necessary to evaluate the potential of the coin and it is not the fan.