Reccomended route if u already finished story in my option is :
1. CT - repeat this until full gear up 80/90 items , this will take a day or two
2. Relic - Grab ilv55 weapon from CG or better one from AH and with CT+mytho gear - this will be more than enough to finish relic in 5 or less hours (max 1day)
3. Work on all ->Dungeons<- that not done (do them at least 1ce , get in Brayflox to cap Soldiery + more myth)
4. Congratulations , now you "overgeared" to do EX/Coil content