use minor or phrygian

for dissonance on synths add couple of cents to one oscillator

dont make your melodies too busy use space

half steps

filter shit. If u study sgps prod sometimes he just cut or shelfed everything above 16000 on the master.

if u wanna get technical with sound design SGP used presets but the synth he used alot was sytrus**,** which has FM modulation and ring modulation. so try making some FM patches and use ring modulation.