I too have returned to the game, when I left I was just clawing my way up the world tier system and last night I finally took out the Tidal Basin and hit WT5. Did it solo, my friends seem to have abandoned me even though I bought them copies (at $3 each, I guess not a massive expenditure, but hey).
So now I guess I have to work out how far I want to go. I was a bit surprised to see that yet more content unlocked after beating Tidal Basin, a few more side missions and some offsite missions too. Before, I had Camp Kenly I think? now I’ve got several I can check out. Guess I’ll just go until I run out of steam again.