There are two basic things that need to be implemented when the market suddenly falls like yesterday to make a profit. First, the attitude must remain calm by thinking that it will recover. Second, take the opportunity to buy as many coins as possible, such as top 10 coins.
Well it sounds good and simple only in reality not very easy especially when the market suddenly falls, lots of patience and experience is required to get pass that point,
however, I do agree with the idea of buying more good coins when the market falls and the cash is available, market will always recover and you may end up in regret if you fail to take advantage of it while you can (meaning having some lose cash and refusing to top up because of the sudden dip).
I know it is not easy to do this, but it still doesn't change the fact that the way to make a profit is literally that. If you can stay calm and buy more when it bottoms than you are going to make a profit, if you can't stay calm and panic then you are going to either miss out on profit or even lose money.
It could be very hard to do this, but it is the way to do it and if you are unwilling to do it because of any reason then you will fail. Obviously making money in crypto becomes very easy at certain periods, or it may become a very difficult thing in some other situations, nobody says that it will be very easy at all times, but if you can manage to handle the pressure and stress that comes with it and stay calm, then we are going to see a lot of good results.