So you’ve nailed all the arps in your A Minor position and you drop two frets down. You’re in a well-worn pentatonic box, but you’re also in G Mixolydian, which has the nice feature of connecting the two tried and true pentatonics. Having the underlying arpeggios at hand makes navigating across the fretboard more comfortable, and it allows you to explore all of the upper structure sounds (Cmaj7 over Am [3,5,7,9] for instance) that let you colorfully solo without even touching the root.
Melodic Minor – I
After listening to a good amount of Holdsworth (and watching this insane video: https://www.youtube.com/watch?v=wts2Mw6Nb5s&t=54s), I’ve realized I need to expand beyond just straight major/minor modes. Here’s an exploration of Melodic Minor in its first position. There are two natural ways to view it in this position, and I don’t have a strong view as to which feels more natural, if either.