Solo guitar sound
"Solo guitar" is an unaccompanied guitar, not a solo instrument in a band.
Solo guitar doesn't really need "sweetening" beyond reverb and maybe a bit of delay. Chorus, flanger, phaser and all the other periodic modulation effects are annoying to listen to in that context. Ditto distortion, compression, or anything else that squashes your playing dynamics.
Just go with a tonally balanced clean sound. You want enough lows and mids to stay away from sounding thin, but not so much that your rig sounds boomy or honky. And enough treble to bring out the note articulation and some shimmer on sustained chords, but not so much that the sound is harsh or brittle.
One hint: Go with a little more treble than you think you'll need, then compensate by rolling back the guitar's tone control a few notches. When the room fills up, the bodies will soak up a lot of the treble and you can easily compensate with the guitar's tone control.