Well since apple is not gonna update those drivers. And it seems like the PZ won't be able to set what i'm thinking is maybe the shader renderer to a lower OpenGL standard i'm gonna have to wait till i can afford to buy a new computer.
You can also go down this rabbit hole in the Steam Support section "Help, I can't sign in". From there you can go to enter your steam account's name which you know. Then it'll give you a bunch of questions. Do you have a phone number? If you do have one already set up with your Steam account you can have a verification code texted to your phone and you can get your account back that way. If you don't have that, then the next possible step is email. I know you said they switch the email associated with the account but just click that tab anyway since it'll say what email is tied to the account. If it's yours still somehow you can get a verification code sent to the email you already own and have your password reset that way. If neither of those work, then THAT'S where you can file a support ticket. I actually didn't need to create a new email and Steam account for you as I just found out but you're welcome to use them anyway if you want. Fill out that support ticket with your current email and they'll get back to you. Seeing as I know for certain your account has been reported at the minimum of twenty times they're prolly eyeballing it and you'll have it back sometime within a week from now if you're persistent. I know this is super stressful but you ain't gonna do yourself any favors getting frustrated or lashing out or being rash. None of those things are gonna solve your problems or make you feel a lick better, in fact they'll only compound the frustration you already have. You gotta do what you can to get by these next few days, but I think you can do it.
(Steam support to see if you can't reset your password.)
(Steam support page to file a ticket to reclaim your account.)
As I said in DM's I don't think Steam is gonna deactivate your account, even if they would it'd still take upwards of a week or two before they'd do anythin'. It's fucked up that it's gone this far but you're gonna have to freeze your card to stop him from buying anything else. Use the Steam and Email I created for you to file the ticket for the lost account, you need to do that regardless. I don't think it's a good to give up an entire hobby cause of this one experience. You can't put into words how much this fucking sucks, but after this is dealt with you won't ever have to deal with anythin' similar to it again and I can show you how to set up a Steam Guard which makes gettin' hacked virtually impossible.
Another slight bit of hopefully positive news is on the Steam Support page they have a section for "I have Charges from Steam I didn't make" so you can file a ticket *there* once you get your account back and you may or may not be able to reverse some of the charges made to your account and get some of your money back. I reckon that alone is enticin' enough to wanna get your account back.
When you file the ticket once you get your account back you're gonna wanna go over your bank statements and track the purchases so you can give them as much info about them as possible. They might be lenient seein' as your account is currently hacked. I can show you how to jump off that bridge when we get there.
(This is their support ticket in case you wanted to know what sort of information you'd be providing once you get your account back. You also have the ability to attach files too.)