..How do you decide where to take the plunge? A certain %drop from the top or a %above bottom?
Or do you just look at previous levels as the traders always mention, Optimism is getting close to some previous tops at $1.3 for example?
You can consider your purchases when the price approaches the support level. These same levels coincide with the Fibonacci level, which is much easier to use than other trading instruments. But you need to remember that the support level can also be broken, so distribute your balance so that you have money left to buy from the next support level.