Frost mage desperate for help

[Havocc]

Please could anyone help me frost mage?
I have recently switched to frost from arcane as I couldn’t seem to get that right either. I am either missing the fundamentals or I am just a bad player (probably both).
Rotation (no elemental)
• Icy Veins
• Frozen Orb
• Ebonbolt
• FOF proccs to extend IV
• Frostbolt filler
FOF – use when available
Brain freeze – I use all FOF proccs up cast Frostbolt, Flurry and IL to shatter.

As you can see from my logs, have a fairly good/ ok gear score but I really struggle with dps 300 -450k.
I would appreciate any help as I’m totally failing as a mage at the moment.

https://www.warcraftlogs.com/rankings/c" target="_blank ... 25/latest/

Thank you in advance for any help at all.