If baroque and mannerism are the characteristic artistic modes of the late stages of a decadent paradigm/societal order, what are the characteristic artistic modes of an emerging paradigm/societal order?
Classicism / minimalism would be the obvious answer.
A "return to simplicity" from which you can go off and explore in new directions.
Early 20th century modernism when we were last full of ideas and energy.
What we think of as "classical" in music / architecture etc. was seen as a return to simplicity, against the baroque which came before it in music and the gothic in architecture.
Minimalism is a similar impulse, although now reacting against 19th century romanticism & excess