Yo you gotta learn how to get source control up and running! I have lost entire projects to this. I took a course on Udemy to learn GitHub and Sourcetree. Hint: The GitHub for Unity plugin sucks really hard BUT if you import it into your project and then delete it, it will automatically set up Git LFS for you ;)
I started in April 2022 but I'm pursuing this as a career
I've used that exact YT video for leaderboards on 3 different projects now hahaha it really is overkill for most of these small projects but it seems to work for the most part