Spoon the Greek yogurt into a medium mixing bowl and drizzle with olive oil. Using a rubber spatula, gently fold them together until just combined, maintaining the yogurt's natural thickness.
Add minced garlic, lemon juice, and lemon zest to the yogurt mixture. Stir gently to combine.
Fold in the chopped dill, parsley, chives, and mint (if using). Save a small pinch of each herb for garnishing later.
Add salt, pepper, and dried oregano, then taste and adjust seasonings as needed. For beach outings, season slightly stronger than you think necessary as cold temperatures dull flavors.
Cover the bowl with plastic wrap and refrigerate for at least 30 minutes, though 2 hours is ideal. This resting period allows the flavors to harmonize.
Before serving, garnish with reserved fresh herbs and a drizzle of olive oil if desired.