Mage/Dark Wizard Help What Can I Do To Improve My Build?

I just threw together this budget spell spam build, which worked surprisingly well. is there anything cheap i can use to improve it?
wynnbuilder github io/#4_0Au0KA0Ig0Rl0RX0uP0tz0UB0VG01111T01111W000010008G
(add periods yourself, i cant post links due to low message count)
Cumulonimbus
Stillwater Blue
Gemini
Memento
Marvel
Photon
Double Vision
Renda Langit
Nepta Floodbringer + king of hearts

 

for nepta use something like this: https://wynnbuilder.github.io/#4_0lS0qz0u50Jq0t80t80TN0OM0VG0j-Y2112-Y1g000010009I
can dual wield prest with this: https://wynnbuilder.github.io/#4_0lS0qz0u50Jq0U60U60TN0OM0A40j-Y2113-Y1g00001006CO
and both triple wield koh