Would really appreciate your input/advise on our first RTW ticket. Two main purposes of the trip are to maximize on miles and make stops that are necessary.

We are based in Paris, but can start the trip in another European city if that helps. On the DONE4 we want to work DXB in the itinerary in order to maximize miles within Europe but cannot seem to make it work. Please review and give me your feedback.

This is our planned itinerary:
lhr-dxb-lhr-hel-jfk-yul-mia-sal-mia//iad-lax-syd-zqn-syd-jnb-cpt-jnb-mru-lhr

Thanks a lot!