I kind of feel the same way, Godwyn’s death was the singular event that started the entire shattering and the breaking of the world that followed and deathblight is slowly and surely killing the world. We get no conclusion or closure to this in any way
Don't really want Godwyn to come back tbh not only because he lacks the soul to even come back but also I think it would be best to treat Destined Death as something you can't simply undo...
It's true, Godwyn should have been the final boss, Radan felt so out of place it was kind of like an ass pull at that point. Read the sword Golden epitaph description and tell me Miquella wasn't close to Godwyn. There is no place in base game that would point to Miquella anda Radan being a thing while on the other hand there is for Godwyn and Miquella. I'm sure it's Radan cause berserk fans.
The reason you're losing is because you're playing like a coward. You need to run at him, not away. You need to dodge into him not away. Also with the damage he's doing to you and you to him, it's clear you're probably not even level 15+ with those skibbidi tree seeds or whatever