If Square-Enix directly asked you for suggestions...

[Critical-Limit]

Put more ways to get end game gear attached to existing content. Make the reward an accessorie if it's something easy.

For example:

Introduce a race in chocobo racing: that would give you a 340 earring.
Maybe at the final floor of Uznair, gives you a ring at a % chance

Harder content could make final floor of palace of the dead drop 340 hands or something.

I just wish I had more to do outside of the same raid over and over again. I personally enjoyed going for floor 200 multiple times. But I prolly would've stuck with it. If there was meaningful reward at the end.

Could make someone beat old unused primals synced. Each one dropping pieces that can be combined at npc for a pair of pants ect ect

Might just be me. I raid and I would like being able to get some pieces in other areas of play.

Not asking you to make more content