Steam allows you to undo an account deletion if the request was processed within the last 30 days. So if the deletion was within the last 30 days you should be able to recover the account.
If it has been past the 30 days, it can't hurt to ask them, but if they are unable to un-delete the account then it will forever be stuck on this profile and cross save set up.
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Alright, thank you. I'll see what I can do