Also, don’t rejuvenate anything until late winter/earliest spring. Too late now to do the job this year, as I explain in my pruning FAQ page (where, actually, the viburnum pruning is covered, too): https://awaytogarden.com/garden-faq/pruning-faqs
When these shrubs are gangly, I normally cut out oldest stems to the ground, or even clear-cut the whole shrub (horrors!), as you will read above. Hard to "shape" a viburnum (cut back slightly) without making a mess.