Stop paying for those branded use-and-throw crap, and get yourself one of those modular chi-fi headsets.
Cables broken? Now you don’t have to throw the entire thing. Want this, but in USB-C? Just get them cables in the format you prefer. Earbuds uncomfortable? No worries, get them replaced. Want to go wireless? Get yourself one of those Bluetooth module - the neck ones, or the around-the-ear, if that’s what you prefer.
I’m actually not an expert and I’ve not used a lot of these, but since you’re looking for something that produces good vocals, you might as well also include balanced signature. Maybe the Final A4000, TruthEar Hexa or the Tin HiFi P1 Max?
Honestly, I’m not sure if you are particular about a good soundstage, in which case, an open-back is probably the best choice, like the one you have right now. Or maybe pick some of the IEMs made by Campfire Audio, like the Andromeda 2020 (wtf, it costs two and a half kidneys)?