Accidentally converted all my data into a windows format (2011 iMac)

So Basically I wanted to install Mac OS Mavericks onto my 2011 iMac, so I went into the purchased section in the app store and downloaded the mavericks installer. Next I followed a guide on how to make it a bootable installer, that all went well. Now for the bit where I went wrong. Now I already have a windows partition on my drive and I decided I wanted to split the windows partition instead of splitting the Mac OS High Sierra partition again. So I looked in disk utility and it wouldn't let me partition the bootcamp drive. I booted into windows and went into the disk manager thing. There it let me partition the Bootcamp Drive. Then I pressed the "New Simple Volume" button but I must've accidentally selected all of the drives because the Mac OS Partition was reading as an NTFS File Format and I was able to access it through the windows file explorer (which I believe is impossible unless it is NTFS or ExFat) anyway I thought I would try to boot back up into Mac OS and see if it still worked. Nope. I held option on boot and when the boot selector screen showed up all I could see was Windows and the Mac OS Mavericks bootable usb I had installed earlier. Then when I tried booting back into windows I just got "Sorry your PC ran into a problem" and the error code was "Unmountable Drive format" or something like that. Now I don't believe all of my data is lost because I could still access it while windows was loaded. I don't really care about the windows data but the mac I need. I do think I made a time machine backup about 6 months ago, but I would like a more recent version. Is there anyway I can save that data?

Thanks