in this case you have to test a lot of EAs and make a good plan for a long time with the strategy testers you have to make several editions in the EA to try to get the best settings for your strategy and management, my advice to you is not to buy EA because everything is free online. and I would not advise even my enemies to trade using forex robots, there are many people who have made them useless, the best way to trade is to learn what works, no robot is bigger than the human brain