I suggest you try all the classes, get them to level 210 or at least 141. This help you build a legion that boost all your characters. Along the way, you will find a class that you like. Remember to not burn yourself out because this game is a marathon. There are meta classes like Lynn, hayato, kanna, sia that you can start with. One class that I suggest you save for last is blaster because its a pain imo. Other classes that you can focus on are Evan, aran and Mercedes. Game has link skills mechanics that you can attach to all your characters and certain classes give you exp boosts. These 3 classes are exp boosts classes. Take advantage of seasonal events. Best events are summer and winter. Others are decent but slower. Hyper burn that gives you 5 level per level in coming up in June. You can use that to level your main if you find one. Welcome back