I suspect what you're looking for is structure to bind what you know together so you can fill in the missing parts of the jigsaw to move on unencumbered to more advanced levels and skills.

You've taken the first step with recognition of a problem or obstacle and determining a remedy and objective, whether the latter is vague or specific.

[br]With that in mind, the beginning would seem a logically sound place to start. That way you'll discover what you don't know and should, and will fly through it in no time with what you do.

Will aspects of it be irrelevent and tedious? Undeniably yes. I suppose it depends upon how thorough you want to be? You'll analyse which lessons you can literally review and afford to bypass.

That's how I'd approach it were I in your position, or gaps will remain to possibly hamper you later. It won't take you long from where you are. Cheers.

P.S. If that is where you choose to start here, in doing so you might want to use [u]Christopher Schlegel's since superseded original Guitar Tricks Fundamentals[/u] Level 1 & Level 2 from where you currently are. Whilst only available in a lower 540p vid res, they're more [u]to the point direct[/u] than I found the softer, Dick and Dora, Nip and Fluff-esque hand holding tenor of the current Fundamentals 1 & 2 courses. Either will take you to where you need to be. As always, the disclaimer OMMV.