Lefty who played a righty for years here, those notes are reachable, just not chords in that position, and quite frankly, unless you play something very specific you'll never need the 4 notes it makes harder to get at.
Pretty sweet riff, but don’t be afraid to pluck it! It would stand a lot more on its own with some dynamics from the plucking hand. Regardless, keep going my dude, you’ve got the spirit 😎
