If you are into hi-gain sustained leads or sustained chords and notes, I highly recommend some kind of BigMuff fuzz style pedal.
And I found an incredible pedal combination for the sustained playing.
SMR Toys N1 Fuzz into ProCo RAT.
Great tone, great playability, sustain for days...
And if I add some gentle chorus modulation, delay and reverb FX from Audified ToneSpot Electric Pro plugin, I am in heaven.
This combination inspires me to write some melodies.
And what is more than great melody???
May the muse be with you!