It appears you have your grounds are using colored enamel coated wire, Audio L (left), R (right ), MIC (microphone), and GND (ground).
To repair,
untwist grounds from the insulated + (positive) core.
strip back enough insulation on the + wires to make your connection to terminal block, wire wherever it going.
the enamel wire wont solder or make connection, you must remove the enamel from the portion of wire you intend to connect. I use heat, usually a cigarette lighter. Be careful not to overheat the wire, you DONT want the wire to glow red, it ruins the wire. Perhaps someone here has a better way, but this is how I have always done it.
Untwist enough of the the enamel wire to get your usable amount apply the heat quickly them remove it, just a half second or so. repeat this until the enamel has burned off.
Before you solder, put heat shrink on each wire, then solder to your pigtail, or screw into terminal block or whatever.
The DISCREET grounds are used for shielding and probably goto a COMMON ground on this consumer grade headset. Dont worry about that, just copy the old plug, if your plug only has one ground (most likely) connect all the grounds together.
you can lookup a pinout, but I usually just hookup the grounds, put on sound control audio test and play ‘hotwire’ roulette (touch the hotwire and listen to your headset to see where your signal is coming from).
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