What increass Wild Strike's elemental damage?

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An attack with Wild Strike consists of two parts: an initial melee hit that functions similarly to a default melee attack and one of the following:

A fiery explosion with the keywords Fire, AoE, Attack
An icy wave with the keywords Cold, Projectile, Attack
An arcing bolt of lightning with the keywords Lightning, Chaining, Attack

Modifiers that require a specific keyword only apply to the appropriate portions of the attack. For example, supporting Wild Strike with Melee Physical Damage will increase the damage of the melee hit but not the triggered attacks. That said, passive points that grant Increased damage with one-handed melee weapons for example will in fact affect the triggered attacks as well if one is using a one-handed weapon, since it is still an attack that is dealt with a melee weapon (though the damage you're dealing is not actually melee damage). Similarly, supporting Wild Strike with Lesser Multiple Projectiles will cause the Icy Wave to fire additional projectiles and deal less damage, but will not affect any other portions of the attack.

Damage conversion: An attack with Wild Strike converts 60% of physical damage to a random element; this conversion applies to all parts of the attack. Like all converted damage, the elemental portion of Wild Strike's damage will be modified by both elemental and physical damage increases.
Additional damage: Any additional damage gains from gear, auras, weapons or any other source (such as Added Fire Damage, Hatred, or Anger) will apply to all parts of the attack.
Tooltip damage: The damage dealt and DPS values shown on this ability's tooltip only indicates the statistics of the initial hit and does not include the random elemental conversion.