Don't touch that SD card!, you may be able to reverse the damage.
Edit:
Solution!!! Follow this tutorial on your sysnand backup. https://gbatemp.net/threads/tutorial-moving-eshop-content-from-emunand-to-sysnand.379879/ Make sure to the opposite. sysnand is your emunand, and the emunand is...
It's not the movies or games downloads that I would worry about, like breaking into networks, downloading encrypted things, spying on network traffic. I have seen so many "Top Secret" seals on files when I was a kid
I was obsessed with finding UFOs, a surprising amount of US files where stashed on computers in other countries, China back in the early 90s omg sooo much