Sorry, really can’t help. I know nothing about macOS. Just posting information that may help you troubleshoot if you are still experiencing a problem.
Since Brave does not crash in a new profile, it may be an extension that is causing a problem. If you have extensions installed, try disabling them. You can then turn them back on one by one to see which extension(s), if any, are causing problems.
General troubleshooting for any OS:
Please make sure you are updated to the lastest Brave version (currently 1.42.97) to see if that resolves the issue. You can also try clearing history/cache for all time on the advanced tab at brave://settings/clearBrowserData, close the browser and reopen.
Older topic links for troubleshooting (specific to macOS):
Thank you for reaching out. @mrivi mentioned that the browser works when using a new profile, which makes me think this may be an extension issue. Can you both please try disabling any extensions you have installed at this time and test to see if the browser still crashes?
I will also note that at least @mrivi is running a slightly older version of the browser — if you can’t launch the About Brave page to update the browser, you can do so by re-downloading the installer from our official website and running it (it will not overwrite anything, simply fetch and apply the newest updates).