@GriffinFrohock ...
Many apologies for broken links. Canvas Community Managers moved some of the links around for Canvas Guides, and you stumbled upon a couple that were in this grouping. The new link (combined for both roles) is located at:
How do I add and modify text in the Rich Content E... - Instructure Community - 618221
About 3/4 the way down the page, you'll find a section on "View Auto-Saved Content".
I'm sorry to read that you experienced a similar issue with your large project. Unfortunately, I don't think there will be any ways to recover the text that you had. If possible, you might want to work on your project "offline", and then see if your instructor would allow you to submit the project as a file such as a Microsoft Word document or a PDF file ... if that is what is required for your assignment. I'd definitely recommend reaching out to your instructor if you haven't done so already. You can do this via Canvas ... by clicking on the "Help" icon on the left-hand global navigation menu. Then, select "Ask Your Instructor a Question".
Sorry that I don't have better news for you, but I hope that you'll be able to get in contact with your instructor soon about this! Good luck!