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I'm trying to finish up Bravely Default too, though I'm somewhat further along.

First thing to note is that you're approaching a very good grinding point.

The next chapter has enemies that give pretty solid JP and money. You can use Compounding with elemental items (buyable from the Adventurer if you've been rebuilding the compounding shops) to easily clear the encounters. You can even get Sweeper bonuses easily, because the attacks do fixed damage.

When you start the grinding, go with Freelancer first. At L10, they get an ability that increases JP gained. You don't need to build up every job to max right here, but it's good for making sure you have what you want in the near future.

As for jobs: get some investment into Ninja if you just want to break almost every fight with an enemy that depends on physical attacks. (Which is a lot of them.) It has a skill that causes you to evade the next physical attack, and pretty much every group-targeting move that isn't specifically a spell counts as a physical attack. This also makes various passive abilities that trigger when you evade an attack significantly more useful.

This has been my strategy and the result of it has been that there have only been a few boss fights where I've had to worry about what jobs I'm using, because the evasion strategy makes them super-easy.

If you want to break things a little less, you might like the Swordmaster's skills. They're good when the enemy consistently uses either physical or magical attacks, as you just need to correctly guess which one's coming to take less damage and do a powerful counter.

You should probably also worry less about healing. With the money-grinding you're about to get access to, X-Potions will be reasonably affordable. A dedicated healer is good, but you don't need three people with a healing command, just a backup plan in case your main healer goes down. X-Potions should be good enough for that.

Speaking of which, your main healer will want the Salve-Maker class or their inherent Healing Lore skill. The skill costs two ability slots, though, so you probably want Salve-Maker to be the main class.