It is best that you try it out for yourself, but if you are going to attempt solo'ing, you may want to build it to do everything, not just melee or just casting, this is always debateable... but at the end of the day, if you decide to get into a group, you may find your build and speed more enjoyable.
Below is just a basic interpretation of what I currently do...
Feeder: Rogue
Sammy: dagger / caster
Pally: caster / healer
Monk etc = caster / healer / melee (never had HH or Alchy so not sure on those)
Rogue: (Pure Intelligence Build)
Dagger / Staff (EE / HM or Int) ... NOTE: Stat ratio means that you still deal effectively with your weapons without adding
Backup Heals are necessary for solo'ing
Built around:
Casting vs Immune Phys
Melee vs Immune Magic
Healing vs 3x EPs and not enough shrineables
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You noted that you have some swords, in this case you would go fighter for the stat "Ratio" to help and pump Int...