Of course, the bull run is going to end eventually. But going with the market sentiments that I've gathered from other traders, the bear market won't come until a couple of months later. Bitcoin hasn't reached $100k and ethereum is still below $5K so there's still a lot of room for growth. But I suggest you take out profits from time to time and hedge some of it back to btc or a stablecoin like USDT or whichever you prefer. Just because it hasn't come yet doesn't mean it wouldn't.
It was definitely expecting to end however we may not know when it would end. Though it is inevitable for us to worry about the coming of bearish trend as it was always expected to happen anytime without a a hint or a signal, so while it is in bullish it is also a good time to take profit and invest at the same time as we are still expecting that the market somehow will probably extend the good market movement rally of our favourite cryptos.