How can I get artisan lillies to produce bigger flowers?
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You can put epsom salts in the water you use on them. The magnesium will help.
Replant in a good compost/soil for blooming. Be generous with the hole size and the soil, or add a good layer of compost 3-4 inches thick and work it in. It Is likely that they need more nutrients to bloom. (Nurseries use a time release fertilizer like Ozmecote.)
Sometimes it can be the location, they like sun and don't like to compete with trees or the roots.
Here's an article that might help - https://www.hunker.com/13426804/how-to-grow-asiatic-lilies