Looking for an upgrade

Got my first pair of IEMs, Kz Castor pro (improved bass) and Kz edx pro x. As a student, I didn't eat for a few weeks just to satisfy my ears of quality sounds and it is looking for more upgrade.

Currently saving up for a 40$ range IEMs. Can someone recommend me around these price range? I am a little sensitive to treble but I prefer sound quality/clarity where I can hear every instrument.

Ps. I'm just joking about not eating, I just don't buy unnecessary things to save up money, it takes months but it is the joy of satisfying your hobby.