$GraniteShares 2x Short NVDA Daily ETF(NVD.US) switched from bearish to bullish last night, with the initial losses already covered and even a small profit made. However, due to overconfidence, when Nvidia rose by five points, I thought there would be a pullback. So I went all-in on NVDA, but unexpectedly, after a mid-session consolidation, Nvidia continued to rise. The result was heavy losses—lessons must be learned.

First, learn to admit defeat. I was firmly bearish on Nvidia, but after its big rally, I was very resentful—this is refusing to admit defeat and fighting the market. When reality doesn't match expectations, one should cut losses decisively instead of doubling down.

Second, stick to discipline. Last night, after switching from bearish to bullish and achieving a small profit, I decided to stop. But I couldn't resist—gambling urges took over.

Third, don't be greedy. After a small profit, I felt like I missed out on Nvidia's big rally. It felt like missing out on a fortune. Fantasizing about a Nvidia pullback, greed overpowered reason.

Fourth, don't be narrow-minded—consider the bigger picture. With the Nasdaq surging last night, shorting at that time was unwise.