evolution itself does evolve. Eusociality or sexual dimorphism, group dynamics and all kinds of complex phenomena obviously weren't present in the primordial soup but are pathways themselves carved out by evolution.

Rate of mutations may change, new mechanisms of evolution may turn up, humans ironically by understanding our genome have acquired the ability to manipulate it in intelligent fashion, and so on.

What has led you to believe that evolution is not itself continuously evolving in each lineage? What do you imagine DNA is for? What do you imagine sex is for? Do you imagine that sexual reproduction always existed, or that it has had no effect on the lineages where it occurs, or their relative prevalence? How do you imagine those lineages became so prevalent, among multicellular organisms?