I think it's too late to prune now, but you could either cut the old flowered stems off now for tidyness or leave them on for winter protection/beneficial insect habitat. If it didn't flower at all last year it probably needs replacing, as others have said. Here's a little blog post about pruning lavenders for your perusal! https://www.greenplantswap.co.uk/talk_posts/316-how-to-cut-back-lavender-and-extend-their-life
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I think it's too late to prune now, but you could either cut the old flowered stems off now for tidyness or leave them on for winter protection/beneficial insect habitat. If it didn't flower at all last year it probably needs replacing, as others have said. Here's a little blog post about pruning lavenders for your perusal! https://www.greenplantswap.co.uk/talk_posts/316-how-to-cut-back-lavender-and-extend-their-life