Add a job ability you can click on with a 1 min timer, to convert Drain spells to give back MP instead (convert HP drained to MP). MP is our main source of damage, we need to keep it up and need to be able to get mp back from monsters that have no MP. Also give a bigger boost to magic accuracy so it's worth using on higher tier monsters.
Add a job ability to greatly increase cast speed of spells and reduce mp cost, that works in a similar fashion to Hasso so you can have it up full time, also add an alt version that greatly increases defence like Seigan. It is no longer acceptable to have such slow cast times when other damage classes can do so much more dmg.
Increase the scythe and staff skill of BLM to A+ and give them some accuracy / haste bonuses, melee needs to be viable. Especially for solo play with trusts.
Allow elemental spells like Burn to have much greater impact on the monsters magic evasion / defence and also that do more damage per tick.