How make item 2 times bigger and makes a command on right click

I have code for right click command using "onUse", but it doesn't work:

{
  "format_version": "1.20.10",
  "minecraft:item": {
    "description": {
      "identifier": "skygen:returnparkour",
      "category": "equipment"
    },
    "components": {
      "minecraft:max_stack_size": 1,
      "minecraft:on_use": {
        "event": "skygen:activate"
      }
    }
  },
  "events": {
    "skygen:activate": {
      "sequence": [
        {
          "run_command": {
            "command": [
              "title @s title done"
            ]
          }
        }
      ]
    }
  }
}

Second thing is make item 2 times bigger. 

I have also code in item: 

{
  "format_version": "1.12",
  "minecraft:item": {
    "description": {
      "identifier": "skygen:scytheofthevoid",
      "register_to_creative_menu": true
    },
    "components": {
      "minecraft:max_stack_size": 1,
      "minecraft:max_damage": 0,
      "minecraft:stacked_by_data": true,
      "minecraft:hand_equipped": true,
      "minecraft:creative_category": "Equipment",
      "minecraft:render_offsets": "controller.render.scytheofthevoid"
    }
  }
}

I think that something should be in geometry:

{
 "format_version": "1.12",
 "minecraft:geometry": [
   {
     "description": {
       "identifier": "geometry.sword",
       "texture_width": 16,
       "texture_height": 16
     },
     "bones": [
       {
         "name": "blade",
         "pivot": [0, 0, 0],
         "cubes": [
           {
             "origin": [-8, 0, -1],
             "size": [16, 32, 2],
             "scale": 2.0
           }
         ]
       }
     ]
   }
 ]
}

Somebody can help me?