is it balanced? or anything i need to add?

... 
{
    "description": {
      "text": "Cursed",
      "color": "red",
      "font": "minecraft:default",
      "bold": true,
      "italic": false,
      "underlined": false,
      "strikethrough": false,
      "obfuscated": false
    },
    "exclusive_set": "#minecraft:curse",
    "supported_items": "#minecraft:swords",
    "primary_items": "#minecraft:swords",
    "weight": 1,
    "max_level": 1,
    "min_cost": {
      "base": 25,
      "per_level_above_first": 0
    },
    "max_cost": {
      "base": 30,
      "per_level_above_first": 0
    },
    "anvil_cost": 20,
    "slots": [
      "mainhand"
    ],
    "effects": {
      "minecraft:post_attack": [
        {
          "enchanted": "attacker",
          "affected": "attacker",
          "effect": {
            "type": "minecraft:apply_mob_effect",
            "to_apply": [
              "minecraft:hunger",
              "minecraft:glowing",
              "minecraft:strength",
              "minecraft:speed",
              "minecraft:fire_resistance"
            ],
            "min_duration": 5,
            "max_duration": 10,
            "min_amplifier": 1,
            "max_amplifier": 5
          }
        },
        {
          "enchanted": "attacker",
          "affected": "victim",
          "effect": {
            "type": "minecraft:apply_mob_effect",
            "to_apply": [
              "minecraft:weakness",
              "minecraft:slowness",
              "minecraft:instant_damage",
              "minecraft:blindness"
            ],
            "min_duration": 1,
            "max_duration": 10,
            "min_amplifier": 1,
            "max_amplifier": 5
          }
        }
      ]
    }
  }