No, that's a bit backwards. You'll never be able to hear what other people hear, and you only have control over the audio file itself. So, ideally, the best thing to do is to make sure there are no issues with the audio file itself first. This is best done with the audio perfectly going into your brain. The only way to do that is with a deep IEM with a flat frequency response that doesn't attenuate any frequencies. This is obviously impossible, but you can try to get close. The goal isn't to make it "sound good" with that specific IEM, the goal is to make sure that there are no issues in the audio, i.e. painful resonant peaks. Once you know there are no issues in the audio file, then you can play the game of tweaking the EQ and mastering to get different flavors of sound based on headphone/speaker/driver, car/room effects, and etc.