You can install macOS to an external USB 3 SSD if you don't want to disrupt the internal SSD. A clean install is when you erase the whole physical drive followed by installing macOS. Then performing a clean install of macOS either to the internal drive or an external drive. The best to way to confirm is by first disconnecting all external devices. The report lists a lot of different Kernel Panics which usually indicates a memory issue, but connected devices could potentially be the source of the problem as well.
Of course while using your laptop normally, any of the items listed in the report are possible suspects as well since those other items may become activated. The report noted a performance issue, so when the report was scanning the system, the items listed as 'Running' or 'Loaded' would be potential suspects. Most of the items listed in the report were not running or loaded at the time of the EtreCheck report.
You are running a lot of app with which I am unfamiliar.most of them being Chinese apps.
