When I was trying to log into my Steam account, Steam wanted me to input the Steam Guard Code, so I checked my phone and there was no code so I tried to change my password and try again, I did it and the password didn't even work, but the last one did, then I tried to disable Steam Guard Verification, after that I was logged out of Steam on both my phone and pc, so I tried to log back and Steam wanted me to input a verification code sent to me via my gmail, but my gmail account has been disabled a month ago and I can't get it back so... I have no idea what can I do now to get my Steam Account back and I'm really worried because I spent a lot of money on it.
If your Gmail Account is disabled, follow this link to try and reactivate: https://support.google.com/accounts/answer/40695?hl=en
If your Gmail account was deleted, then maybe try and reopen the account with the same email address. This will let you get emails for the Verification Code.
I am not sure what else you can do to sign in. Good luck, and hopefully Happy Gaming!