When to Reroll
You should only reroll an item when it is likely to POE currency give you meaningful improvements. Here are some guidelines:

Item Base is Valuable: If the item base is already great (e.g., high energy shield, high life, or a useful modifier), reroll it with Chaos Orbs for specific minion-related modifiers. For example, if you have a rare Body Armour with high life and resistances but no Minion Life, use a Chaos Orb to add it.

High Affix Potential: Items with already good affixes are more likely to yield better results when rerolled. Focus on rare or unique items that have the potential for a high-tier mod roll.

Goal-Oriented Rerolling: Have a goal for your rerolls. Are you aiming to increase Minion Damage or Minion Life? Focus your Chaos Orbs only on those items that directly benefit the goal you’re working toward, such as improving your helmet or body armor.

Endgame Preparation: Reroll for endgame content, where you’ll need the best mods for maximum performance. As you approach higher-level content, focus on rerolling the most crucial pieces of your gear (such as Helmets or Body Armor) to maximize the effectiveness of your Spectres.

Conclusion
Avoiding the temptation to reroll every piece of gear in Path of Exile 2 will save you valuable Chaos Orbs and help you focus your efforts on the items that truly matter for your Spectre build. By being selective about which pieces to reroll, you can ensure that your resources are buy POE2 Currency spent efficiently, leading to a stronger and more effective Spectre build in the long run. Focus on high-value pieces like Helmets, Body Armor, and Rings while saving your Chaos Orbs for key upgrades, and always reroll with a specific goal in mind.