Elden Ring - Nagakiba duels (Lvl 150/Samurai/Dex build)

Over 100 hours in so need plenty of time to 'get good' or negate the 'skill issue' parts. This is a dex build with the Samurai as starting class. In this video, I was level 150. If you have any technical advices as how to punish certain weapons or spells/sorceries/incantations seen in this video please let me know. I have a very difficult time dealing with range and sorcery pvpers. Also the other technical advices such as how to counter or when to roll against a spell or weapon would be appreciated as well. Here is my build and any equipment or spells you can suggest to improve my build or stat allocation, I am all ears.
Level 150/Dex/Samurai
Vigor - 50
Mind - 30
Endurance - 39
Strength - 18
Dexterity - 50
Intelligence - 10
Faith - 12
Arcane - 10
Weapons: +25 Nagakiba, +25 Long Bow, +25 Finger Seal, +25 Brass Shield
Gear: Aristocrat headband, scaled armor, scaled gauntlets, scaled greaves
Talisman: Prothesis-Wearer Heirloom, Claw Talisman, Shard of Alexander, Millicent's Prothesis
Spells: Bestial Sling, Bestial Vitality, Bloodflame Blade

[@lcmhkice153]

The lag on the last dual. 😜😜