if you bought it once for a bag of sunflower seeds, then the task arises to sell it dear, and not to devalue it, fortunately, there are media and dreamers like us.

THINK!

If someone is buying the coin, it means someone is selling it, and thus its price should not change due to speculation in the market! It can rise if it is in short supply or if there is long-term investment...
What is illogical here or what am I missing?

Many repeat the same nonsense without real evidence, claiming that a bull market or bear market fluctuates the price, but this could be a lie...