I had my ficus bonsai for about 2 years. My family went on a 2 day Christmas vacation. When we got back, I saw that my bonsai had yellowing leaves. I didn't think much of it because the first year I got it, I under watered it, and it did the same thing (After watering it more often it recovered within a few days). I have been watering it for the past few weeks, and now there are no leaves. I did a scratch test and the base was perfectly healthy, but the branch appeared to be dead. I have been researching for a while now to save it, but nothing is working. I was thinking about chopping off the branches, but I’m scared that is will only get worse and truly die. I'm praying that maybe it would start recovering in the spring and summer. What should I do?