mythic ghuun killed ? glad title obtained ? all mounts / pets collected ? all allience races unlocked ?
if not then no you did not exhaust new content.
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and what is wrong with playing multiple alts ? it doesnt require much effort past initial +/-100 hours put into leveling (for 12 alts from 110 ->120) .
unless you are just jealous people dont waste time on runing pointless gear threadmills and enjoy game other way that as bonus let them make milions in wod/legion .
i for once hope token tank up to 20k - so i can spend my milions on 10 years of wow gametime :P