Is it permissible to pluck eyebrows to change their ugly shape, which might lead to deviance or suicide?

If the eyebrow hair is excessively long to a degree that disfigures, it is permissible to remove only the amount that removes the disfigurement, not for the sake of beautification. As for what was understood from the questioner's words regarding thoughts of deviation or suicide, this is a serious matter. This world is fleeting, and the Hereafter is the abode of permanence, goodness, and eternity. A person must fear Allah concerning themselves, adhere to His law, and make the Hereafter their primary concern. Whoever does so, Allah will unite their affairs, and the world will come to them submissively. But whoever makes the world their primary concern, Allah will place poverty before their eyes, and nothing will come to them except what has been decreed for them.