The Crimson Moth by Kristen Ciccarelli

Set in a revolutionary fantasy world where witches are persecuted, the story follows Rune, who leads a double life: a socialite by day, a secret vigilante (the Crimson Moth) by night. She rescues witches and uncovers dangerous plots, and even targets a witch hunter, Gideon Sharpe, to infiltrate his world — only to find her heart betraying her mission.