Even when I am 100% sure about my trades, I’ll still won’t go with max leverage which is more than 50x time my original investment. For me, keeping the risk level to the minimum stands before the profit bar is important. Especially for beginners, it's best if they don’t risk too much both in investment as well as leverage.
Both money management and risk management are important concepts in forex trading. One needs to know how to allocate a budget for every investment as well as how much risk they are undergoing with each. Keeping the balance between these two will decide the profit level.