Should You Get a Furnace Protection Plan From Reliance?

My furnace broke down, so I started YouTubing a bunch of potential repairs. I learned what a “high limit switch” and a “flame rollout switch” is, and figured out how to reset it, and 3 hours later — my furnace was working again!

Fast forward a week later, and the furnace stops working again. I try doing the same reset trick, but no luck. I spend another 6 hours running up and down the stairs, trying out different suggestions from YouTube but nothing works. I learned a lot more about how furnaces work, but not enough to fix this issue.