All images stopped resolving

I should also note that I have 2 other sites on the same hosting and one of them is also WordPress and they both work with no issues.

I see mixed content errors in the console when I inspect with Chrome Dev Tools. Start by checking https://www.whynopadlock.com/

https://developer.chrome.com/docs/devtools

Now I broke after changing the default URL in General>Settings to https

You can change that back directly in your database by following these steps: https://www.ads-software.com/documentation/article/changing-the-site-url/#changing-the-url-directly-in-the-database

You’ll find phpMyAdmin in your hosting account’s control panel.

Once you fixe that, following up with Lisa’s reply, make sure that you aren’t trying to loading any images via their https:// URL on https:// pages.