My final destination on my ticket is in Brisbane how can I connect a flight from Nairobi to Brisbane?

Hi, I am in Kenya and I have a returning flight with Qantas in Nov. I would like to return to Australia by changing my flight or rebooking again. How can I get a flight from Nairobi, Jomo Kenyatta Airport back to Australia as hear there are repatriation flights connection through London and thro...