DPS Job Breakdown

[Mimilu]

Well:

~Bard: You mainly place your two DoTs and keep them up using Iron Jaw, place Flaming Arrow, keep Straight Shot up, cycle through your damaging oGCDs and Heavy Shot, and use your Songs accordingly. A lot of people didn't like the addition of Wanderer's Minuet but as a caster, you shouldn't have any problems adapting to it.

~Summoner: Summon the right pet for the right thing (Ifrit for trash and multiple enemies, Garuda for bosses and single-target), place your DoTs, tell Garuda to use Contagion (if you have her up) and if the fight needs it, placing her in a good spot, placing Shadow Flare, balance Dreadwyrm Trance and Aetherflow (this might be the hardest part of the job), and get Deathflare off before Dreadwyrm Trance ends. This might be easy for you transition into, seeing as you've already have Arcanist at 60.

-Monk: You want to keep Grease Lightning III up, watch your positionals, keep Twin Snakes and Dragon Kick up, keep Touch of Death and Demolish up, go through your rotations correctly, weave Meditate in to get your Fifth Chakra, watch out of AoEs, and watch your TP.

~Machinist: Very similar to Bard in that you cycle through oGCD and your combo, maintain Hot Shot, maintain Lead Shot, and use your turret's MP/TP recovery accordingly. Your weaponskill combo is RNG-based but can be easily manipulated using Ammunition for Reload and Quick Reload. However, your main goal is Wildfire and doing as much damage as you can while it is up, which can require a lot of button-mashing. Also, using Dismantle and Mind Rend accordingly during fights.

~Black Mage: A very precision-based and time sensitive job with maintaining Enochian, switching between Astral Fire and Umbral Ice, having your rotation dictated on how low you can get your MP before having to switch, and keeping a Thunder DoT up. It also doesn't have as many oGCD bursts like SMN does, so it's a bit more stationary, especially with Ley Lines (and no one likes Scathe for some reason). Mastering using your support and defensive abilities, Manaward, Apocatastasis, Manawall, and Aetherial Manipulation, is also a must.

~Ninja: Learn how to use Ninjutsu (Which can get messy with server ticks and lag), get Huton up and maintain it with Armor Crush, use Suiton for Trick attacks, use Doton and Katon for AoE, use Kiss of the Wasp and Kiss of the Viper stances accordingly (if you don't need to stun, use Kiss of the Viper the buff to Mug), use Goad when other TP-based jobs in the party need it, maintaining Mutilate and Shadow Fang, and, if there is no Warrior in the party, maintaining Dancing Blade. Also, use your other-non-Ninjutsu oGCDs, watch your TP, watch your positionals (they're all rear except for Armor Crush, which is flanking), and watch out for AoEs.

I'm not 100% familiar with Dragoon but from what I know: Maintain Blood of the Dragon using Fang and Claw and Wheeling Thrust, both of which are proc-based and require you to go through weaponskill combos to get, use Battle Litany whenever it is optimal, use Elusive Jump correctly, watch your positional, maintain Heavy Thrust, maintain Phlebotomize and Chaos Thrust, and use your other Jumps and oGCD attacks correctly.