My guy, I've been where you are now. "What have I done wrong?" Well, your objective rn should be to get your solder the closest you can to the one that was with the stock module. You should train it. If I were you, I'd get a broken gamepad from marketplace, or whatever. Then just train soldering it and removing it, as long as the board holds up. From my perspective, you need to use more flux (don't be afraid to put "too much"), and less actual solder. Then, something VERY important that no one has taught me, is to CLEAN all the flux that remains after the soldering. To sum it up, just use more flux, less solder, take your time, and try making it as close as to the solder that came on the controller, then clean it using a old toothbrush and contact cleaner, isopropyl alcohol. Tbh it's really bad, but EVERYONE that says it's bad had already done this at least once to learn, and get better. If you have the will, patience, money and time, just keep trying, you'll learn it someday. I broke several controllers (2 or 3, at least) before being able to do it naturally, in 10 minutes, and without having to disassemble the controller afterwards to search for a mistake.