You can switch the G7 chord to sus4 or to add 7 to Fm (the note Db) to make it a bit more interesting.
Main Theme: Fm G7 Cm Cm (repeats throughout the whole song)
Bridge: Fm Bb Eb Ab (back to main theme)
Chord Shapes:
EADGBe EADGBe EADGBe EADGBe EADGBe EADGBe
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