1.21 Item Attributes

I want to be able to change things like Attack damage and attack speed as a way to upgrade these weapons. However I am pretty stuck on how to do that. My latest attempt has been with ItemAttributes and this not good helper class.

public void replaceModifiers(EquipmentSlotGroup pSlot, Holder<Attribute> attributeType, AttributeModifier attributeModifier, double amount) {

        AttributeModifier modifier = new AttributeModifier(attributeModifier.id(), attributeModifier.amount() + amount, attributeModifier.operation());

        ItemAttributeModifiers.builder()
                .add(attributeType, modifier, pSlot)

                .build();


    }