In my simplest mind - solo in sections.

Section 1 = slight melody
Section 2 = Shred
Section 3 = return to and embellishment on melody
section for = Ladder to climax

Or Single note/Double stop call/response style

Or Go modal...E minor penta, to E minor, to a Dorian movement, back to pentatonic, maybe a little Mixolydian to brighten it up, back to Penta for the finish.

Vary the register and the style...low/high/low etc