What one factor can cause the current bull run to stop ? Like US making some law against bitcoin.
The market is cyclical, there is always positive news that is spread to trigger a bull market and there is always negative news that impacts the market causing a bear market. If you look at the history of previous cycles, you will see only one scenario being used over and over again.
Like bitcoin, we can't predict, we will never know what news will make the bull market stop and turn into a bear market. But we know for sure that at some point, the bear season will come so let's always keep an eye on the market, take profits at the right time and don't let the bears take away all our profits.