What to learn if you feel stuck

I'm currently working for an SEO agency and after sometimes, I find that I do not know what to learn next and where to learn it, there isn't any new things I could learn from my colleauges, so I go on Youtube just to find every SEO video talking about the same thing, "focus on quality content". Is that it?

Focus on research and planning if you have no clue. Then once you get pissed that you haven't taken action on the obvious that you know and found to be lots of opportunities, you'll get better each time you do a project. Eventually, you only make killer MVP projects each time. They don't have to earn thousands or hundreds, but a few different projects in areas you know about and can see an opportunity in is easy once you start looking everywhere with hunger.