Mage/Dark Wizard Help My old build is awful, hoping for help

I've been off of Wynn for about a year, and I guess before I left I threw together something abysmal that isn't really working for lvl 100+ content. Was hoping for some help to turn this into something at least usable if not good.

(cant post links, not enough posts, sorry)
https:// wynnbuilder. github. io/builder/#CN0AwM6vecPK5dL9ZA7iFlEQum00INm96g7657o2Gp+7VyqMjZ3
Wynnbuilder build:
The Siren's Call
Libra
Gemini
Nether's Scar
Photon
Summa
Jiandan Handwraps
Stellar
Cascade [w6w6f6]

I don't have any mythics, and I've got close to 2stx saved up in case i need to buy anything. Can't even use LI or Qira Hive items since this isn't strong enough to do those
My intended playstyle that's the most fun for me, is high attack-speed lightbender, feels really satisfying

 

I know it gives end-game people the ick, but I briefly used a Morph set + The Nothing riftwalker build to complete Qira just to get her items. I just typed in "morph the nothing quira" on Youtube and used the first thing. I died like 15 times learning how to play riftwalker but I eventually defeated her.

If that doesn't work or you really hate riftwalker, here are some resources you can try:
Sugo's Ultimate Build Guide - This is the definitive guide for builds. There's a non-mythic section.
Blue's Builds (on discord) - This used to be the definitive guide for builds in 2022 or so. Blue is back from retirement, though, which is wonderful news
Nori's Collection of Builds - I think this is mostly mythic builds, and I'm not sure how good they are, but Nori does have some videos as proof *shrugs*