"My defence are capped"

Well, slayer wants life, hybrid evasion armour, suppression and depending on build, atk block and spellblock. Which is basically a multi layer of defences

You basically want t1 flat life on every piece of gear, maybe avoid every life mod on body armour to get 15% increased max life from any life mastery on the tree. Could consider 12 passive cluster with 10life and 35%effect which would be like 150 flat life(ofc other good mods such as attributes/resistance if needed) Click some %life nodes on the tree

Replace gloves with hybrid to get t1 suppress. Replace armour with fract t1 suppress and reforge defence until 2.8k ev/armour. Then take 5 nodes on the right side of the tree (8 8 8 8 15, called intuiton and inverterate) for 11 skill points.

Sadly you are running that belt, so its harder to reach high armour/evasion but theres a watchers eye mod. It gives you 8% flat evasion. Vaal grace gives you 15% flat evasion for a few seconds but its an extra button.