As of last week, FFXV got its 1.05 patch that ended the Carnival event. At this point in time, time limited quests will start making their way into the game. The first one consists of dealing with 100 cactuar like mobs. It's a good opportunity to get an easy 150K gil, 333 AP, and some exp. Prompto's Gravisphere is very helpful for this long battle. This is also a good time to max out most techniques that may not be maxed out yet that you may plan on using later on.