During bull run, we have to invest for long term and not short term because the market moves very fast during the bull run. If we sell and think we can buy back when the market falls we mightn't be able to buy back because of the fastness of the market in rising up. We are supposed to have prepared before the bull run comes, we're meant to have accumulate Bitcoin doing the bear market. Our risk tolerance are supposed to be set up during the bear market.
Managing our emotions is very important if we want to make profits during the bull run and it can be done by investing only spare money, just because it's the bull market doesn't mean we have to invest everything we have as during the bull market too, the price of Bitcoin can fall and make us to lose therefore we have to invest wisely.