Pretty sure I fried my PSU, what now?

Hey, new here.

I tried to conjure up the Luckfox internal JB mod based on Modded Warfare's tutorial, once I got to GND connection on USB solder pads turned out they have little to no area to solder on, so I decided to try and scrape a bit of masking off in hopes I can reveal enough area to get a good solder glob down. But that didn't exactly work out (image 1&2 in red).

After that I decided to search for another GND pinout and decided on the fan connector (image 2 in green). I looked up which connection is GND with multimeter and during the testing I'm pretty sure I tripped the short protection twice (the console shut off after I made sparks, who could've guessed). But the console still booted after those blunders.

Since the USB pads weren't exactly trustworthy connection points I also opted to use the PSU 5v connection instead, since it had a nice solder pad available and gave the necessary 5v. (image 1 in blue)

After the making the VCC/5v+GND and the necessary RJ45 connections I tried booting again, but this time it beeped and turned off completely, no amount of button pressing/holding or re-plugging the cord made a difference.

Since something went catastrophically wrong I decided to remove all the wires and try button/plugging again (it didn't work). While removing wires I somehow managed to remove one of the RJ45 wires with it's pad. I tried scraping again, but nothing of substance came of it, so now there's just a scraped off spot there. (image 1 in purple)

I tried the PSU test thing where you short pins 1&4 to send 12v on those long pin/rail? things and the "rails" were showing 0V in every configuration.

My question would be can I be 100% sure it's dead? If so I guess the next steps are buying a replacement and figuring out if there's anything on the pcb that would kill the new PSU, but if there's a chance to save money I'm all ears.

If any soldering masters come across this, I would appreciate helpful tips on how to improve, this was my "first" soldering. (I'm not going to count soldering the pins onto a Arduino sensor 5 years ago)

Apologies if this is a duplicate thread(may I be forwarded to original post)!