How can you make your Mirror/Blink Arrow minions stronger in Path of Exile? First, you'd better have enough poe orbs. And then, you should read the following guidelines carefully.

A good bow: I recommend Storm Cloud or Roth's Reach until level 66, then switch over to Lioneye's Glare. See rationalization for Lioneye's Glare in the FAQ section.

A good quiver: a quiver with Increased Projectile Damage or Increased Elemental Damage with Weapons will give increased damage to your clones. Flat physical or elemental damage on the quiver will benefit your minions as well. Quivers with increased critical strike chance or multiplier will benefit your clones.

Skillpoints: the only nodes in the skilltree which benefit your minions are nodes that have the word "Minion" in them. Nodes that do not affect your Mirror/Blink arrow clones include: Trap/Mine nodes, Bow nodes, Elemental damage nodes, Critical strike, chance/multiplier nodes, Attack Speed nodes.

Support gems: any support gem that affects Minion Damage, Projectile damage, Elemental damage, or Attack damage will affect your minions. The Trap Support gem will NOT increase your minions' damage, because the modifier only affects damage dealt by traps. However, the Multiple Traps and Cluster Traps gems WILL decrease your minions' damage, because they contain a general "Less" modifier which is not specific to Traps alone.

Auras: we will use flat damage from elemental auras to increase our dps. Wrath + Anger > Hatred. Use Generosity to multiply your auras' effectiveness. You can also use Empower or +gem levels to boost your auras' damage, poe items which grant +gem levels for your auras include Alpha's Howl, Geofri's Crest, Voidbringer. You can also craft a Bone Helmet with an Essence of Delirium to get more aura levels.

Elemental Equilibrium: Wrath and Anger are supported by Generosity, which means that our player character deals 0 elemental damage. This is great, because if we get a ring/amulet/glove that deals at least 1 cold damage, we can apply Elemental Equilibrium on enemies and make them have -50 fire and lightning resist. This is a huge damage multiplier, and should never be left out of the build.

Curses: Elemental Weakness and Projectile Weakness. Can also use Temporal Chains or Enfeeble for defense. Buy poe currency on https://www.u4gm.com/path-of-exile if you lack of them.