Ever heard of an FC? Maybe join one and ask for help? You're gonna need it once you begin your relic quest and get to Titan HM. The problem is obviously because you don't know how and where to get help. If you don't want to join an FC, then go shout in Revenant's Toll or somewhere there's a lot of people and hopefully someone will answer your call. Repeating DF after failing again and again is not a way to solve your problem. Have you watched youtube for tips on the fight? Have u explained to the aoe dps what to do at AV's boss? You'll be surprised how easy that boss is once the AOE dps (bard/blm/whm) know what to do during adds.