How do I grow big Chrysanthemums ?
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Just water and feed them when needed. Much of the size is out of your control. Weather, climate, soil, sunlight. All influence our plants.
Make sure you buy healthy-looking plants to begin with, and give them a bit of fertilizer when they need it. See this guide to fertilizing your chrysanthemums: https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/fertilizing-mums.htm
When feeding your plant make sure the middle number (phosphorus) is larger than the other two. This will help to make a plant with larger blooms.
The first number (nitrogen) will produce a large plant but with a lot of leaves.