If BTC continues to decline, you can check your actions according to this list:

1. Check your mindset: If you feel fear and want to sell, tell yourself—"Cutting losses turns unrealized losses into realized losses, and is a suicidal act."

2. Keep cash: Never go all in. Keep 30%-50% of your cash as "ammunition" specifically for picking up chips during a decline.

3. Give up on predictions: Don't guess "Is 70,000 the bottom?" As long as the price drops to your preset support level and shows signs of stability (like reduced volume), go ahead and buy a little.

4. Embrace volatility: Declines are not scary; what’s scary is having no volatility during a decline. Volatility is a friend of quantitative traders because only with volatility can you trade and reduce costs.

In summary:

Don't try to sell at the highest point, and don't try to buy at the lowest point. As long as you have chips in hand, there is a chance to turn things around; as long as you have cash, there is a chance to pick up bargains. And "trading" is the bridge connecting these two opportunities.