Kernel Panic on boot

Remove all banned add-ons and repos, try again, and post another log, if the issue persists.

Also drop the overclock settings you added to config.txt and check if your RPi works fine without them.

Overclocking abilities are very specific to each individual devices, some can't be overclocked at all while others will happily run at 2GHz - there's no guarantee for anything so take every guide that tells you that setting X and Y work fine with a huge grain of salt - at best take those guides as a rough starting point while for checking which settings work with your particular device.

If you overclocked your RPi and something doesn't work right the first thing to suspect is always that the overclocking parameters you used don't work for your device - so remove them before digging further.

so long,

Hias