I have a Witchblade Beginner guide here, that aims to beat Celestials in easily farmed gear.
Obviously you are beyond that level of gear, but there’s still some relevant info in the “build mechanics” section and below in “Celestial fights”.
I’ll have to say, that the Cadence version (in the first reply) had more trouble staying alive, and could not defeat Celestials. Simply because it took too much burst damage and doesn’t have the same defensive layers as the Blade Arc versions.
Maybe with better gear, you have more success.
Ravager of Souls is harder for melee, he will drop a puddle under your feet that makes you miss nearly every attack and deal 70% less damage, iirc.
You can still beat him on melee characters, but typically you have to reposition a lot to avoid the Sunder totems and the puddle.
Good luck!