Thank you very much for your replies.
I am not sure if I can afford business class with the amount of miles I have. Also 180k for RTW economy doesn't sound that much considering individual one-way tickets between regions are usually 40k-60k?
If I want to start in Europe and do Dubai-SE Asia-Sydney-South America-South Africa-Europe, how do you suggest I proceed with planning my main ticket? Also where can I check how many miles I need with partners like United?