So, do you think you have most of these skills already? In the unlikely event that you do have these six top skills already, then that's a great achievement. Do keep in mind that there is always room for improvement, and learning is a lifelong endeavor. So, continue to improve these six skills, in addition to learning new ones as well. If you want to become, and continue to be, a successful and great manager, then this is a necessity, not a luxury.
If you feel you have some way to go, then don't worry; that is completely normal and okay. It's rare for a developer to have mastered these six skills without having real-world experience of being a manager. It is also an unreasonable expectation because even most experienced managers will still have some way to go!
Your task now is to truthfully assess how mature you are...