Hi Michael, 

Welcome back to the guitar!

As John suggested, you could move into studying a particular genre of music that you like.

And/or, you can look through the Songs section and see if there are some things in there you'd like to work on.

If you come up against some foundational skills or concepts that are not quite solid for you yet, you can always refer back to the section of one of the Fundamentals Courses that covers that skill or information in detail. 

Good advice, john of MT!

-Lisa