Like everybody else, I say the same things, but I also note you want help for the Mac, without getting a new PC.
Search for the term
core temp for mac
I have no idea about Macs, but Core Temp is a little program for Windows that keeps an eye on your CPU temperatures and lets you know how close to the line you’re getting. There are equivalents for Mac. It won’t help, but it will give you more accurate information than your lap does. (Unless those numbers you quoted were already from an equivalent, in which case — done!)
Set your graphics to minimum and use these macros to reduce the load even further:
except that you will need to leave Projected Textures ON, because those include stuff on the ground that can kill you.
Now check out laptop cooling pads. They help, and they’re not expensive. Check reviews on Amazon.