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You still have quite a few segments unused - max 20 in total.

Unless starting in europe, or have somewhere particularly want to go, I'd only do 2 european legs (to maximise mileage).

LHR-MCT-LHR is a good one if crediting to QF as just over a SC threshold. It also connects well from Australia to LHR and LHR-LAX.

If starting in europe (so no need to visit Canada), then change NA-Asia segment to JFK-HKG.

Could do 2 more legs in SWP. Perhaps PER-BNE-AKL-MEL/SYD?

Some long routes within asia are HKG to KHI (Karachi), BOM (Mumbai), CMB (Colombo).