Use Chains of Emancipation and Shackles of the Wretched to gain instant maximum Rage and keep high Berserk sustain. This video features my Wild Strike Berserker.

Gain Maximum Rage immediately after dipping below 25 when Vortex tags enemy. Press/Hold a key or cast on left click. Use a second Curse with Temporal Chains and Hextouch to expire Temp Chains. This counts as "Losing Temporal Chains". Gain Curse Immunity while you're at it.

Forum Guide: https://www.pathofexile.com/forum/view-thread/3009645/page/1

PoB: https://pastebin.com/gmK4mQiZ