Transportation (like chocobos and airships), mailbox, better LFP system, revamp BR, improve DoH/DoL SP gains so that's it's on par with DoW/DoM, balance leve SP rewards, not necessarily in that order. Place priority on balancing SP gains, followed by LFP system, BR, transportation, and finally mailbox.

Almost forgot: LS system, fix it. Give us the ability to change leaders and kick/invite people when they're not right in front of us. Show us what zone our LS mates are in. Basic utility stuff, you know?