Diversification

Trading one currency pair will generate few entry signals. It would be better to diversify your trades between several currencies. If you have 100,000$ balance and you have open position with 10,000$ then your core equity is 90,000$. If you want to enter a second position then you should calculate 1% risk of your core equity not of your starting balance!. It means that the second trade risk should never be more than 900$. If you want to enter a 3rd position and your core equity is 80,000$ then the risk per 3rd trade should not exceed 800$

It's important that you diversify your orders between currencies that have low correlation.
For example, If you have long EUR/USD then you shouldn't long GBP/USD since they have high correlation. If you have long EUR/USD and GBP/USD positions and risking 3% per trade then your risk is 6% since the trades will tend to end in same direction.
If you want to trade both EUR/USD and GBP/USD and your standard position size from your money management is 10,000$ (1% risk rule) then you can trade 5,000$ EUR/USD and 5,000$ GBP/USD. In this way, you will be risking 0.5% on each position.