6. Flasks
Quicksilver Flask:
The Quicksilver Flask increases your movement speed, which indirectly can make it feel like you're attacking faster because you can position more quickly, but you can also link it to Attack Speed modifiers.
Lion's Roar Flask:
This flask provides a boost to Path of exile currency physical damage and attack speed, particularly useful when you're building around physical-based attacks.
7. Buffs and Aura Effects
Some aura effects or buffs can also increase attack speed.

Blood Rage:

This skill grants attack speed at the cost of life, and it's perfect for any melee or high-speed build.
Haste Aura:

This provides attack speed and movement speed for both ranged and melee builds. Haste is a solid option for Path of exile currency for sale scaling attack speed in most builds.
Flesh and Stone (with Sand Stance):

This aura offers additional attack speed when used in Sand Stance, boosting your attack speed significantly.