I think an INFJ is most likely to be associated with Watery signs with Strong Moon influence and the most likely Zodiac sign is Pisces.
I will explain why
Pisces is the natural 12th house of zodiacs, 12th house is the house of Spirituality, Enlightenment and also the house of Detachment(Self-Less). Pisces is a sign associated with Empathy, Compassion, Intuition, Spiritual and being alone.
Other watery signs are
Cancer - Ruled by Moon, the crabs are emotional, being the 4th house Home environment, more about self.
Scorpios - Ruled by mars, and known for their deep mysterious nature, and might have an aggressive outlook, which does not suit INFJ.
More than the ascendant, it is good if the Moon sign is Pisces, Moon signifies all motherly qualities - the Compassion, Caring, Nurturing and Affection, it is like the Queen showing warmth, grace, and femininity. Moon rules our mind, and people with strong Moon are often emotionally stable. Of course, the Moon should not be afflicted with malefic to function at its best.
Aspects and Conjunctions of Moon with other planets like Mercury(Intellect), Jupiter(Wisdom) will alter the results according to their position.