Q.how to get a jasmine thats half dead back to life
I have a vine of jasmine left and it’s half alive and looks like a mess but I want to bring it back to life. Should I prune it back a lot and see what happens or just give up and plant a new one?
You can plant another one, but it might be helpful to learn what happened to the first one, so the same thing doesn't happen again. You can also prune severely, and see what happens. I'm going to give you a couple of articles on growing and pruning jasmine, but without knowing more about what your "mess" looks like, or which kind of jasmine (there are dozens of different plants called jasmine) you have, I'm afraid I can't be more helpful.
https://www.gardeningknowhow.com/ornamental/flowers/jasmine/growing-jasmine-plants.htm
https://www.gardeningknowhow.com/ornamental/flowers/jasmine/trimming-jasmine-plants.htm