I want to Transfer to Hyperion, But can not.

[MistakeNot]

I would say to try early in the morning at approximately 2-5 am time frame. Otherwise as others have stated, it will have to wait until the hype has ended which will probably take a month or two.

Trying early in the morning only works for non-Congested servers that have temporary lockouts for character creation.
Hyperion is officially Congested, which means that character creation as well as transfers to it are completely locked down until further notice. Changes to the Congested/Preferred status of servers is always accompanied by a notice about the change on Lodestone as well as on the launcher, and normally happen in conjunction with normal maintenance.

[Pixiehawk]

When Stromblood launched it was locked up. I know because I had wo wait to make my AuRa alt. And it was preferred pre launch so everyone moved/created here.

It might take a while, but I'm pretty sure it'll open up again.