Why does it drop as soon as you buy? These two weak points—I took three years of losses before I finally figured them out.

I believe you're not alone—when the coin was consolidating, you held back and didn't move; but the moment you entered, the K-line turned downward as if it had eyes. When it dropped, you thought it was a "discount sale," rushed to add positions, only to find there are 18 more levels down. It's not really luck working against you—it's that the order in your head is completely twisted before you place your bet.

The first pitfall: Seeing only price, without "trend" in mind.
A price drop ≠ cheap. This illusion has killed countless people.
For example, a coin climbs from 100 to 200, and you feel it's out of reach. Then it falls back to 150, and you get itchy—"Finally a chance to get in." But you never ask yourself: Is this 150 a breather on the way up, or just the first stop on the downtrend train? The former is a pullback, the latter is a halving—the outcomes are worlds apart.
I've set a hard rule for myself: First gauge the direction, then the scale. When the daily moving averages line up like stairs going up, and the price touches a key support level, only then do I consider entering. If the moving averages have already drooped, no matter how strong the bounce, in my eyes it's just the last escape route—I never reach out to catch a falling knife.

The second pitfall: Your mind is full of "how much can I earn," but you've never calculated "how much I could lose."
The most common dream before entering a trade is: "If I hold this, can it double?" But few people force themselves to answer: "What if I'm wrong—how much of my hard-earned money am I willing to throw in?" Trading is not gambling; you need to write your own "stop-loss will" first. For example, when I enter with 1000U, the first thing is not to calculate how high it could go, but to clearly set the bottom line—lose at most 5%. When it hits that red line, I cut it off without mercy, never fooling myself with "if I hold a little longer, it will come back."
Only by locking losses in a cage can your mindset stay steady; when the direction really proves right, then you can confidently hold onto your profits.

Finally, let me share a line I have engraved on my computer:
Before placing an order, first figure out how to lose, then figure out how to win;
First look at the big picture, then find a small position;
First manage risk, and profits will naturally come to you.