Opening multiple trades in the same direction is a bad way to trade because opening multiple trades in the same direction increases your losses and the size of your trading lot as a whole and this leads to high margin requirements on your account to hold that position. also there is no limit that after how many pips you have to open a position in the same direction you can open a position whenever you want in the same direction and there is no limit to that, but you have to make sure you get profit in doing so