To achieve high profits and high win rates in 100x contracts, the key lies in the following points:

1. **Fixed Total Position**: Stick to not over-investing. Even if the market is good and you can earn tens of thousands of U, you must ensure that losses remain within a bearable range so as not to harm the principal.

2. **Start Small**: When opening a position, initially invest a small amount of capital to test the waters, for example, invest only 10 U, and observe the market reaction. If the market trend aligns with expectations, then consider gradually increasing the position to reduce overall risk.

3. **Use Profits to Increase Position**: When increasing the position, only use the profits already obtained, ensuring that even if the market fluctuates, the principal will not suffer losses.

4. **Decisive Stop-Loss**: After making a profit, promptly set a stop-loss level to ensure that the profits earned are not eroded by market fluctuations, avoiding profit reversal.

In terms of operation techniques, it is recommended to cap the funds at 300 U, initially using a small position to test the waters, and only increase the position with profits when the trend is clear and the confidence is above 70%, while also setting a stop-loss. If the market goes against you, for instance, shorting when BTC is at 60000, use 10 U with 100x leverage to open a position, and add to the position only after further confirmation of market trends and accompanying negative news to ensure the safety of the principal.

The core strategy of 100x contracts is: fixed total position, start small, use profits to increase position, decisive stop-loss, ensuring that one can still protect the principal and achieve stable profits amidst market fluctuations.