have you tried this going to https://support.discordapp.com/hc/en-us/articles/209813978-How-do-I-enable-disable-Push-to-talk-activation-noise-
this part of the Discord website?
have you tried Sennheiser GAME ONE with a Frequency Response of
15Hz-28KHz
or did you try looking on a website called "wish" to get the best kind of headphones that you are looking for because they have some good prices online :)