Imo there is no specific objective purpose in life for self aware lifeforms. I think human life is the fusion of consciousness with sensation in search of subjective meaning. I also believe that the creation of life is the result of the random confluence of favorable conditions within the context of a given time and space.
To drink copious amounts of Fosters; eat copious amounts of Full Englishes; and watch copious amounts of Pointless.
If you stop doing it you have no existence. Whst is the purpose of a porpoise? It does nothing consume and are allegedly the brainiacs of the seas.
We don't live on a piece of dead star? Why does life give off photons if we aren't consumers of dead stars?