PoE Multiple Totems, Witch, Cold, Duration builds

This is the one build I played this league to 40/40. It was very fun and definitely kept me playing when I was on the fence. The PoB is of my current character. Typically I get to a point where it's "enough" to cruise through challenges and I stop prioritizing build investment, so I'm pretty confident it has room for improvement as-is (e.g. helmet w/-chaos res, watcher's eye, faster ignites synth staff, +3 corrupted chest), and definitely has room for improvement if you want to go more glass cannon. I'm also not usually good at making builds, so I could very well be missing somethin