In terms of sub fees, there's no free month this time, so don't go and pay SE 26+ bucks(XI sub((depending on # of alts)) + XIV sub when you return for Stormblood). Just tough it out and wait for Stormblood.
I came back to XI because I got tons of unfinished business. If you completed everything, it appears all there is currently is this thing called Ambuscade. https://www.bg-wiki.com/bg/Category:Ambuscade