There might be one way how u get ur account back. So take picture off ur passport and send it to steam. That only way to prove that ur the owner off that account
wait...what!? how does sending a picture of your passport help in anyway. steam doesn't require any of your personal data....
if you can't remember your steam name/password, just follow this guide from steam: https://support.steampowered.com/kb_article.php?s=02696343ce458f34af9a993064d546b8&ref=4988-DHXV-7272