You don't need to be afraid, you own a Lifetime license and you do not have to be worried loosing it. Even in case you are not actively using your account right now and just want to save it for later, you could loose only your old setup and potential data when you account get suspended and removed, but not your license. In case you would like to find out more about the process with inactive accounts and potential consequences, feel free to check this article that will answer the most common questions in this matter: https://support.liveagent.com/701120-What-happens-with-inactive-account