Any large dip is a good time to buy and bitcoin is more than 25% down from it's all time high. We could expect it not to stay low forever. Though we should be cautious not to put everything on at this moment as we have seen crypto bearish trend remain for 4 years. It's a good idea to bag promising coins with your extra savings but it's not the time to take all your investment into crypto. Myself, I'm buying and holding a small amount of coins every month with a small percentage of my monthly salary.