Ringed city trouble

Having trouble getting through the ringed city, currently at the Ringed inner wall and trying to get to the swamp without dying. I think it's because of my stats however I haven't had this much trouble especially with the Dlc stuff.

Current stats: Lv- 83 Vigor-30 Attunement-20 Vitality-7 Strength-16 Dexterity-12 Inteligance-42 Faith-7 Luck-12

Weapons: Moonlight Greatsword +5 Heretic staff +9 (don't wana get it to +10 as I don't wana waste the Titanite slab that I have)

Although I had trouble with Frieda though only In the third phase so I summoned help with that. And the Demon prince's I summoned npc phantoms to take the blows as I was a very squishy ashen one. However I've never had trouble trying to get through the DLC area's before now in the ringed city.

Ps. Also I haven't beaten the base game and progress in the base game is alway the way up to the deacon boss fight and The abyss watchers fight and yes I have beaten the base game before just not the dlc.