Arpeggios work well for improvising over chords. One resource is "Artful Arpeggios" by Don Mock ISBN 0-943686-07-5 published 1977 Hal Leonard Publishing Corp
You could try to re-activate the glue with a hair dryer... be sure not to apply too much heat, maintain adequate distance and keep the dryer moving. Hold the material down with painters tape while glue cures.
Sad news Bailz, After seeing your guitar's broken headstock, I remembered watching a video with Bob Taylor of Taylor Guitars... he mentioned his repair center is available to all guitars. If you are not planning on doing the repair work yourself, or do not have someone to help you. I thought you mig...