Not my usual content, but hey, why not (watch at your own risk of boredom). Long story short, my watch seemed to crap out on me so the easiest and cheapest way to fix a budget quartz watch is to just replace the movement. I don’t have any of the correct tools, but it mostly goes well so if you’d like to do something similar then this might be useful to watch (pun intended).
Purchased the parts on Esslinger (not affiliated with them in any way).
Fossil Diving Watch Model AM4239
Movement: Miyota 2315 by Citizen
This model may have been discontinued, but I’m not sure.