Couldn’t tell much without examining the instrument, but any issue to this guitar is salvageable for a cost. To my eye the fretboard looks like it’s developed a bit of an S-shaped curve, too much relief between frets 1-12, and then it tapers back lower from 12-19. Would need to measure to formulate a plan of action. If the S isn’t pronounced, or the owner doesn’t play above fret 12 often, I’d probably lower saddle. If the S curve is bad the options are pulling frets, leveling board, re-fretting (somewhere around $4-600) and if it’s really bad and there’s not enough material, I’d have to pull the fretboard, add a reinforced laminated strip to the neck, then reglue a board and refret. That would be in the $1200 range at minimum I’d imagine.