See if you can get some party finders up for doing all or mostly blue mage parties for old content. Might prove entertaining. It's something I potentially planning to do once mine is 50. I never got all my ponies back in the day and it'd be interesting to not rely on high level jobs undersizing it. Titan Ex was my favourite back in the day, so I might end up trying to build a party for that. Technically there's loads to do, I guess it's getting people to do it, but there's a party finder available if you don't have the people for it. You never know, you might find people who don't mind a nostalgia trip through old content synced to level 50 or people who joined later who haven't done older content or have only undersized them.

I think what would be useful is a "Limited Job Roulette" or a few different ones as I think we are so used to relying on the duty finder, so you could have 50, trial and raid Limited Job roulettes, give rewards for higher level content for the added incentive. Whilst it's just Blue Mages, it could be interesting to relive older content from a different angle, helps give it life where being "OP" doesn't matter if it's what everybody going in expecting anyway, especially on content that can be undersized.

It could be an opportunity for SE to actually breathe life back into older content but still be beneficial when your mains are level capped.