peq is entirely personalized, people can give you guidelines in the form of targets like the Harman or Crinacle/IEF targets, but really, you just have to find things out yourself. It's easy to go onto squig.link or hangout.audio to find out your own iem first and then using the autoeq feature on a target. Then make adjustments to your preference.
No one can really tell you what you like/will like, the same as with music genres. I could recommend you metal whereas you could be completely averse to it, you just have to try it out yourself to see what you like