Started playing a bit again after not playing for 2 years. (Yea, so that's a couple of months after GvG was released). Anyone been in this position and what's the best way to catch back up?

The game gave me a few packs and some dust to get started again and with the dust I already had I crafted a couple cards I was missing for the pirate warrior deck that's in the meta right now (missing leeroy and patches though but still works).
Is it just a matter of getting back to the grind now? I love this game but I hate how quickly you get left behind in irrelevance if you stop for a bit.