Can't get my Blizzard Sorc past T10
I've played this character through the season and I've hit something of a wall. I can push ~105 in The Pit and fairly comfortably do T10 content, but if I try to go higher or do things like Baal, Mephisto or Diablo dungeons I really struggle.
I've followed a maxroll build with the only real change being keeping Stone of Jordan for survivability because I've not yet found the Ring of Starless Skies.
Here's my items and talisman: Build Planner: Mesinat (Sorcerer). I've followed the above build guide for Paragon so haven't added that, and my skills are all filled up as you'd expect so haven't added them.
I also have a basically dead skill slot (no.3) because having Teleport there reduces the effectiveness of Orisvane (and means I have to have Teleport Enchantment). What should I use there instead?
Is this just a case that I need to be slowly improving my gear where I can? or is there something I'm missing?
Thanks for the help!