Invest in fundamentals and you'll sleep well at night.

If you're buying meme coins with no real use or value just because other people are doing the same thing then of course you'll freak out when prices drop. You're gambling on a ponzi scheme.

The analogy that Warren Buffett uses is that you own a productive farm. You understand farming and you have a general idea of what your farm is worth, and you also have a crazy alcoholic neighbor who keeps offering you a different price for your farm each day. Why would you sell your farm to your neighbor just because you think that he'll offer you a lower price tomorrow? Why would you buy your neighbor's farm just because you think that he'll ask for a higher price tomorrow? It's the wrong mindset.

Do your research. Does your coin have a working product, a solid use-case, and a team you can trust? Is it at a price below what you believe its actual value to be, or to be in the future? That's how you know whether to buy or not, and then it doesn't really matter how the market shifts. You just wait until your coin is at or above what you think it is fundamentally worth and then you sell. Simple :)