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.
People go into crypto all-in and that is the biggest problem that many people have when the price drops. If you are not all-in then you could use the other amount you left in the account to buy more when it drops. However if you are all-in then all you can do is watch it as it goes down.
This is why I believe that we should not be going all into anything and always have some liquidity available to us at all times. Sure it is not going to be as simple as just putting some money in, but it is going to at least allow you to have that possibility so that you can do it. Without any money left, you can't get in even if you want to and that is the biggest problem.