Hey, I restarted about 3 years ago, took a break for about 2 years and have been back 4months or so and am currently making an alt.

I noticed your blu spell troubles. You need to skill up your blu magic. I suggest, skip up to 60+ or more, get your AF hands. And do a regional tour type adventure of farming spells. I love my blu. It's so useful for everything. It shares gear with THF light armour, and BLM armour among others ofc. Those two are also great jobs for getting shit done.

In terms of being available for progression, you can offer GEO which borrows some BLM gear. Your BLU can then magical aoe too. Between aoe BLU dmg or GEO; you will be able to start filling in more gear, and round out jobs that overlap, into more and more jobs being available. The top tier endgame requires the furthest refinement, but much of the content that you do to achieve that can be done on your "fun" jobs til they become your fully refined options. Jack of all jobs, still needs a fleshed out master or two.