Cut out all the dead wood as it isn't going to do anything. If you are bothered if it dies cut it down to about 2-3ft tall. I have done this several times over the last 20 yrs and mine has come back every time.

if you don't want to risk it dying remove 1/3 from the shrub this yr then another 1/3 the next and the final 1/3 the year after. then keep it pruned to size every year after flowering.

Thanks Seaburngirl. I will cut back 1/3rd. Do I still cut it right back even if there are leaves on the ends of the branch?

Yes even if there are leaves. there will be buds lower down in the branches.

Don’t worry too much Pdb, we cut ours back hard a week ago and it’s already showing new growth.