My trick of how to transfer your untransferrable account..
-Deleted Email Account due to inactivity for 1 year or more or other reasons.
-Combination of forgotten PIN, Password, Secret Answer, inaccessible email
Since Garden CC doesn't provide any help from you, like it happened to me, I hope this helps.
This is only my suggestion, depends if you're really desperate enough to find a way to transfer your account.
Make another account (Should be accessible, making another mistake will be your fault)
Make at least two characters (Lvl 2 and a Lvl 80 Chronicle)
Since Server Merge is already a thing, you can add your Character (from new acc) to your other Character (old acc) as a friend
Once added, now start using a Seal Stamps to seal all of your sealable items [NOTE: ONLY SEALABLE ITEMS ARE SEALABLE, IF SOME OF THEM ARE UNSEALABLE, THEN THERE IS NO CHANCE OF TRANSFERRING YOUR SPECIFIC ITEM, I SUGGEST YOU NEED TO GET ANOTHER ITEM LIKE THAT (eg: Rune Weapons)]
Note: Sealing items is really time-consuming and expensive (except for those people who are desperate, they won't care if its expensive), it is more time-consuming when you don't have special stamps (because you can only send 5 per day)
Send it to the character you added as a friend (I mean your ALT)
Seal Stamps are really expensive in TH, but you can have some for free when you loot it in dungeons or you opened a lvl up box.