Delete my old account linked to [edit: email address removed]

I haven't had access to this account for many years. This account, linked to [edit: email address removed], was created for playing Battlefield. I currently don't have any access to this email, and I'm having trouble linking my Steam account. I can't link it because my old email address is blocking it. The support team at @mail.ru refuses to restore my access.I want to link my new EA account with a currently working email, and link my Steam nickname with DeadOlap.

I recently bought Battlefield 5 and really want to play it. But this problem is stopping me.