Scales to Play Over G#7sus4
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#7sus4 chord contains the notes G# – C# – D# – F#. Any scale that includes every one of those 4 tones fits over it — from the root G#, that means G# Natural Minor, G# Minor Pentatonic, G# Blues, G# Dorian, G# Phrygian, G# Mixolydian, G# Dorian Bebop, G# Mixolydian Bebop and G# Spanish. Start with the first scale listed: it is the most common choice, and the others color the same chord tones differently.
G#7sus4 is also diatonic to 4 major keys: B major (relative minor G#m), C# major (relative minor A#m), E major (relative minor C#m), F# major (relative minor D#m). 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.