Answer: Amaryllis are considered robust and should repeat their performance for many years. The plants do need a period of warmth before they'll produce a bloom, so perhaps that was missing this year. Since the foliage appears healthy, I'd take a chance that the bulb is taking a season off from blooming and will produce a flowering stalk next year. Continue to care for it as you've been doing and give it another chance. If it fails to bloom next year, replace it with a healthy new bulb.
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