You can run your own nameserver and add a new tld there. But this won't help you much, as the TLD will only be visible to the users who are using your own nameserver. The "official" TLD like ".ly" are countries, see: official list
The ICANN website does have a Contact page, and one subject category is "New gTLDs", so they probably get requests like this a lot. I don't know if they'd actually create an extension just for you, but if they get a lot of the same requests, I'm sure they'd do something about it.
Management of most top-level domains is delegated to responsible organizations by the Internet Corporation for Assigned Names and Numbers (ICANN), which operates the Internet Assigned Numbers Authority (IANA) and is in charge of maintaining the DNS root zone.
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您可以运行自己的名称服务器并在那里添加新的顶级域名。但这对您没有多大帮助，因为 TLD 仅对使用您自己的域名服务器的用户可见。
“官方”TLD（例如“.ly”）是国家/地区，请参阅：官方列表
You can run your own nameserver and add a new tld there. But this won't help you much, as the TLD will only be visible to the users who are using your own nameserver.
The "official" TLD like ".ly" are countries, see: official list
ICANN 网站确实有一个联系页面，并且一个主题类别是“新 gTLD”，因此他们可能会经常收到这样的请求。我不知道他们是否真的会专门为你创建一个扩展，但如果他们收到很多相同的请求，我相信他们会采取一些措施。
The ICANN website does have a Contact page, and one subject category is "New gTLDs", so they probably get requests like this a lot. I don't know if they'd actually create an extension just for you, but if they get a lot of the same requests, I'm sure they'd do something about it.
你不能。只有 IANA 可以。
以下是可用的 TLD：
You can't. Only IANA can.
Here's a list of available TLDs: