Need help improving my RF Jugg build

https://pobb.in/vXN_VzpuPVx4 Damage I am not to worried about didn't play this build expecting to 1 hit everything but my issue is I have no clue what I am missing to improve my survivability I am doing t15ish maps and just get 1 hit by a bunch of stuff and have no clue what it even is most the time just randomly die if there are a bunch of mobs around and even single on bosses I can die have to actually run around and actively try to avoid every single little thing.

First off your life could be higher and so could your max resistances. Max res should at least be 80%, if not more. Second, you need a new sceptre and you completely ignored the minion damage passives on the skill tree which is 46% extra damage. Plus you're not even using molten shell. Get that and put it on your left click so it's procced a lot.