What can we do to encourage blooms on our wisteria-now over ten years?

We have had this plant for ever ten years. We have read that it should be cut down each year and other times we have read not to cut it down. Either way....NK blooms but the plant itself grows beautifully with many many tendrils that climb and twist around a upright pillar at our front door. Hate to give up on it and take it out.
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