How exactly did the lid get cracked? Whether that has symbolic significance is what should matter most to you about whether it is working, but if it is making a mess, transferring the contents to a new jar may be an idea. Or if you feel better about making a new one, it's totally up to you.
Honey jars take time. It's a bit of a symbolic thing in that respect; honey is sweet, but it flows slowly. Some people have had quick results, while some have claimed months. I think there are many factors which can explain many outcomes, and the timeline is very much unpredictable.