It is impossible to buy all new meme coins, and expect that one of them will bring a profit exceeding the purchase costs. Here we need accurate information from the team about the new launch of the meme coin and the budget that is allocated for the pump. But only those investors who have acquaintances in this project can get such information.
Not all that glitters is Gold. Some coins are worth the investment, while others are nothing more than just pure garbage. I'd say all of the "meme" coins are junk, except Dogecoin which is the oldest "meme" coin in existence. This last one has a tried-and-tested Blockchain network with a large community behind it. Not only that, but it also has Elon Musk's endorsement. Neither Shiba Inu, nor PEPE, nor Floki Inu have the advantage Dogecoin has. They could fade into oblivion in a blink of eye. Dogecoin could lose its value overnight, but it won't die because of the reasons mentioned before. It's a wild and crazy world out there, so expect the unexpected for the new PEPE coin. Just my opinion
Dogecoin has been around for so long only because it has been hyped a lot of times and as you said, we can also see Elon pumping it every now and then which is always keeping the hype alive within the community and people holding or buying it are always hopeful and waiting for a teaser from Elon.