So I completed the game, 68 hours in like level 54.... What do I do now? I wanna do a NG+ but I guess I want to collect all the weapons I missed and what not? Where are good places to grind? What do I do to get good levels? What about items? Could someone give me a link or post me some spoilers please? I loved this game and want to play more and have the season pass.
I went all the way from ~40 to ~90 in a few hours. Theres a meal you can buy in Altissia that doubles exp earned for a short period. You couple this with expericast magic which is just an effect gained from crafting spells with certain items such as debased coins and whatnot. Then go on the hunt for weak enemies that you can get the highest grades possible on, preferably ones that cause you to parry frequently as this increases finesse(?). Cast the expericast magic on them to wipe them out, it doesnt matter if you only get 10exp for killing the enemies, you just need to ensure you get as many A grades as possible as this modifies total exp earned.
When you've finished using all your expericast magic, sleep at the hotel in Altissia which costs 30k and triples experience earned. The total exp earned doing this will be based on how many exp collectibles you found during your playthrough, so exp earned will vary.
As far as expericast magic goes dont just blow all your expericast items at the same time. The bonus exp earned is based on the expericast level of the magic, not the base potency. From what i've read its a linear relationship so expericast lv4 grants twice as much bonus exp as expericast lv2, so you want to find determine the most efficient use of these exp items. From memory this occurs when using ~8 items when crafting the magic as that is the point where you get 6 spells, past this point the potency also may taper off and no more magic carges are earned but this varies from item to item. Use a calculator if in doubt, something like [expericast potency * charges] / [items needed for creation] will give you the optimal usage. If you find you only have one or two of the expericast items then it might be worth saving them until you get a few more to get better 'value' for your items.