At this point the guide splits out into many, many subsections. Rather than give you a set path I've decided to organize this by level, or if you scroll down further, by category. Just click on the options you're most interested in to read up on. I've marked systems that are critical to growth that you'll really want to read up on to ensure you know how they work so you can make the most of them.
Go through this list at your own pace, there's tons of info here so don't overload yourself!
Adventure Handbook (Critical Growth System)
Adventure Skills (Critical Quality of Life Skills)
Collections (Growth System)
Pets (Growth System)
Cooking (Growth System)
Aesir Monument (Critical Growth System)
Alchemy Merging (Growth System, Extremely Low Priority)
Various Guild Facilities (Critical Growth Systems)
Cake Battle (Group Instance)
Endless Tower (Group Instance)
Enchanting (Important)
Chaotic Invasion (Group Instance)
Oracle Dungeon (Group Instance)
Valhalla Ruins (Group Instance)
Echoing Corridor (Group Instance)
Oracle Mirror (Growth System, Whale-ish)
Niflheim Purgatory (Group Instance)
Rune Box (Critical Growth System)
Thanatos Tower (Raid Instance)
Divine Tree (Growth System)
Frost Statue (Growth System)
Ancient Relics (Growth System, Megalodon Whales)
Lost Isle (Group Instance)
Ponape Museum (Group Instance)
Shadow Realm of Phantom (Group Instance)
Time Rift Dungeon (Group Instance)
Palace of Beauty (Solo Instance)
Cloudsea Archipelago (Growth System)
Equipment Memory (Growth System)
Palace of Ghost (Group Instance)
Ponape Secret Realm (Group Instance)
Battle of Kafra (Wednesday's Only)
Big Cat UFO (Wednesday's Only)
War of Emperium (Thursday's Only - PvP)
MVP Battle (Friday's Only - PvEvP)
War of Crystal (Sunday's Only - PvP)
Louyang Dailies