LAMMPS Simulation Help: Troubleshooting High Thermal Conductivity and Other Issues

For future reference, please have a look at the forum guidelines post to learn about best practices and how to get the best help here. For example, the script code in your post is messed up and practically unreadable because you are not quoting it correctly. There is also information missing that is usually required for providing meaningful advice. At the moment, you very much limiting the kind of help you can get.