Last year, the podcast that, by far, had the most responses was my episode that helped career beginner guitarists. They are guitarists who have played for years and years and never seem to get any better.
I've found by helping a lot of "career beginner" players that they have several issues in common. The biggest one is lacking the fundamentals in strumming and rhythm.
Today, I help these struggling guitarists learn:
Once you have your solid rhythmic foundation together, you have a big part of the tools you need to start moving forward again.