1 - 30 - Do all your quest
30 - 170 - Do all the PQ in the D-Mirror
170 - 200 - Do all your quests timeline from Time Temple
200 - 250 - Advanced to 5th Job and do all your training in Arcane Island (Get all the symbol)
Always remember to take advantage of 2x events, 2x coupons, and Runes. (Link Skills) is a must.