u/DingoOne3711

I’m new to gardening and i have a line of boxwood trees along the drive way and I believe due to neglecting it and harsh winter it has started to die. As you can see in the picture the front of the line is pretty much dead and towards the end it’s still green. I don’t know what to do and how to save it(if I can). I put mulch at the roots as well as pruned some of the dead heads but don’t have experience with fertilizers or anything else.