Changing lol Server Region

Hey guys ! I created mt account in NA and transfered it to OCE because I now live in Perth, but in 6 months I'll be back to Europe and I will transfer again my account to EUW. The thing is, when I go in the shop, I can only change my In-Game name and there's no more server transfer. Even if I have the 2600rp to transfer it still no possibility to change region. Idk if it's not available during pre-season or something else and I'm wondering if you can only change region once. Feel free to tell me any information you have, thanks.
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