Taking Ukraine will always be far more important to Russian than Syria, and Russia is taking Ukraine. Cost of living crisis in the west is in Russia's interest, as is Trump's isolationism. Russia wasn't getting much out of Syria, they're getting far more out of Ukraine.
Plus there might be deeper considerations, even before 2022 I've been pondering a question, Putin won't live forever, so how does he ensure Russia after him won't be infiltrated or scammed by the west again. The only solution I can think of at the time was a direct conflict with the west, one that does not escalate too much, but one intense enough to culturally ingrain the west as their enemy, and cut western financial and cultural influence on Russian society. Then Ukraine happened.
Russia doesn't need to be a superpower these days, Russia just need to see US no longer being one, that goal is being advanced nicely right now.