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Two ideas -
Vary the rhythmn of the recurring power chord motifs by lengthening or shortening, adding or subtracting rhythmns (ex you have approx a dotted quarter+eighth note rhythmn with the accent on the eight note, see what happens when you add two sixteenth notes), shifting the accent.
Change your harmonic colors from predominantly minor to major or something in between.
Lastly, I think you would profit much from 16th century counterpoint and keyboard harmony. The 16th counterpoint doesn't require an extensive musical background - just know your intervals, bass and treble clefs (knowing C clefs would be also helpful but not necessary) If you cantake a course in it that would be great or get the Jepperson counterpoint book. If you are proficient with piano then keyboard harmony isn't going to be difficult but it would be a good way reacquaint your harmonic knowledge (and extend if need be).
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