Two good suggestions, cheers @brokenbetty and @ChasnotRobert
Pittosporum tenuifolium can make a great backdrop too and is unfussy, scent is amazing when it's in flower too.
Can you at least cut out the obviously dead bits and maybe ascertain what's killing them?
@andyfallsoff started
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Two good suggestions, cheers @brokenbetty and @ChasnotRobert