Scales to Play Over G#sus2
Every chord is a subset of several scales: any scale that contains all of a chord's tones fits over it. Pick a chord to see the matching scales from its own root, the major keys the chord belongs to, and full fretboard diagrams for every scale on guitar.
A G#sus2 chord contains the notes G# – A# – D#. Any scale that includes every one of those 3 tones fits over it — from the root G#, that means G# Major, G# Natural Minor, G# Melodic Minor, G# Harmonic Minor, G# Major Pentatonic, G# Rock 'n' Roll, G# Dorian, G# Lydian, G# Mixolydian, G# Dorian Bebop, G# Mixolydian Bebop and G# Gypsy Minor. Start with the first scale listed: it is the most common choice, and the others color the same chord tones differently.
G#sus2 is also diatonic to 5 major keys: B major (relative minor G#m), C# major (relative minor A#m), D# major (relative minor Cm), F# major (relative minor D#m), G# major (relative minor Fm). In a song from one of those keys you can also solo with the key's own major scale or its relative minor pentatonic across the whole progression, not just this chord.