Skript that decreases the time need between attacks

[20Spaces]

Im creating a Skript where every time x happens than the player gets a reduced attack cooldown. I thought I could use the attack cooldown function for this, however that only represents whether an attack is full charged. I believe the correct thing to do is to change the attack cooldown attribute , however I am unaware of how to do this. Could I have an example?

 

[20Spaces]

To clarify I want this to be applied to the player not the player's tool

 

[20Spaces]

Update:

on death:
    set {speed::victum's uuid} to {speed::victum's uuid} + 0.5
    set {speed::attacker's uuid} to {speed::attacker's uuid} - 0.5
    loop all items in the inventory of attacker:
        if loop-item is any sword or any axe or trident:
        add "{AttributeModifiers:[{AttributeName:""generic.attackSpeed"",Name:""generic.attackSpeed"",Amount:%{speed::player's uuid}%,Operation:0,UUIDLeast:8055,UUIDMost:772149}]}" to nbt of loop-item

on first join:
    set {speed::player's uuid} to 0

on inventory slot change:
    if event-item is any sword or any axe or trident:
        add "{AttributeModifiers:[{AttributeName:""generic.attackSpeed"",Name:""generic.attackSpeed"",Amount:%{speed::player's uuid}%,Operation:0,UUIDLeast:8055,UUIDMost:772149}]}" to nbt of event-item

I think this might work? However this Skript just sets the speed of an item, I want it to add or subtract from the usually speed of ___ item. Any thoughts on how to do this?