Might be because the "traditional" parties got to be led more and more by oligarchs and the regular citizen feels more and more disconnected from what is happen

Might be because the "traditional" parties got to be led more and more by oligarchs and the regular citizen feels more and more disconnected from what is happening up there. On the other hand the authoritarians play at the same time big on the populism so they get wins after wins being the only ones promising their voters a reconnection to leadership. You could ask, what's so difficult for the old parties to do the same and I can only shrug and assume they don't care that much because the oligarchs are the ones paying.