You didn't say against who you are getting destroyed but it is easy to see that you are lacking a tank, change the goblin caster for a goblin defender, it is the only tank you unlocked although you only need to defeat 3 slimes to unlock it, the slime can also work as a good tank with offhealing capabilities.
If you want to tank yourself you need to change your skills and manifestation, water is good for tanking and you didn't show your gear but it is clear it can still improve. There is also a good tanking trinket for completing the three guild quests.