Go play fishing minigame and do the fishing quest first and it will get you like 10~ level in fishing, which is a decent boost to your talent points for your warrior classes
start buying distilled water in alchemy liquid shop everyday, you will need it to craft your tab 2 weapon and efaunt armor
Rush to Specius on the 3rd map for each character to get them their Subclass. Barbarians, Bowmen, and Shaman are the best choices while in world 2.
Alchemy will maximize your efficiency. Check these videos for full details,(links in description), but in short, just make sure to unlock new bubbles when you can and upgrade them whenever you can
Remember to equip big bubbles when you get them
Sandcastles (Accuracy), Moonmoons (Active Exp), and Snelbies (Card Drop Chance) are the world 2 cards that are the most helpful for progressoin
Once you've unlocked the post office, the most important boxes to upgrade are: Fight (for Afk characters), Utility (for your main active character), and All the skilling boxes for their respective classes (i.e Mining for Warriors, Catching for Bowman specifically, etc)

As soon as you enter W2, you should push your character to reach the third area of the world, where you can meet Speccius and advance to the next class of your character class.