Unable to Access Account / Unlink Steam Due to Lost Email Access

Dear Support Team,

I recently bought a game on Steam, and it automatically linked to this old account. The issue is, I no longer have access to the email address associated with this account.

Because of this, I'm completely locked out of making any changes. I can't change my username, unlink this account from Steam, or even reset my password. Every time I try, it asks for a verification code that's sent to the lost email address.

I'm not worried about any old games previously bought outside of Steam. My main priority is to figure out how I can unlink this account from Steam so I can link new purchases to a different account.

For example, I bought Battlefield 1 on Steam yesterday, and it immediately linked to this account upon its first launch. THIS IS NOT NORMAL!!!

Any help you can offer would be greatly appreciated.