Basics of investing in the currency market:
1/ Do not buy and the greed index is more than 35
2/ Do not buy with all the amount you have and buy in parts if the price drops more than 20%
3/ Do not buy if there is important economic news in America such as interest rates and consumer data
4/ Do not sell your currencies at a loss unless there are indications of a sharp decline in the market to preserve capital
5/ Rely on the currency alarms you want to invest in
6/ Beware of investing in new currencies because their collapse is very fast and unexpected
7/ Do not use leverage except during times of market decline and with low leverage, but in the case of an increase, it is preferable to buy the currency to reduce risks
This is not a general rule, but this is my personal opinion and you may have your own strategies