Pruning Cupressus Goldcrest

I think I would leave it and see whether it grows out more next year. I'm not an expert because I don't have one of these myself. With some Cupressus the normal shape is narrow, depending on the variety.

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All depends on the EXACT cultivar you have, the ordinary 'Goldcrest should need no trimming to thicken out, but if you have 'Wilma' or 'Goldcrest Wilma' as I have seen it listed this one also grows fast but is a much narrower selection and would be somewhere in the region of twenty feet high by about three - four feet wide at maturity, also can have a habit of outgrowing its roots and blowing over in gale force winds, hope this helps.