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Once you find a system you need to back test it and work out what is your stop loss, take profit, amount of lots per trade and then work out how many pips you want per day, per week per month.Ignored
I backtested hundreds of trading systems in my life and I know for sure that if you put any limit on your profits you will leave a LOT of pips on the table.
If you are a day trader for example, a better and more profitable alternative is to close your (profitable) position(s) at the end of the day (before midnight if you live in the US), that way you take your profits to the max.
I know this sounds counter-intuitive but this is by far the best way to maximize your profits, instead of simply closing your position after a fixed amount of pips (10, 20, 30, etc...) has been bagged. This is at least what all my backtests reveal.