So far, so good! Now, I recommend opening a Github report over here: https://github.com/brave/brave-browser/issues/ providing the ID’s of the crashes and all other details regarding your issue so far. Crash reports have a high priority for Brave developers, shouldn’t take long until someone responds to your report.
I’m currently looking at this Github report: https://github.com/brave/brave-browser/issues/17054. Over there one of the developers claims the enable-experimental-web-platform-feature flag might be the cause of random Brave crashes. I believe it won’t hurt if you try disabling the flag at brave://flags. If you see nothing changes after disabling the flag, restore its value back to what it was, and open a Github report instead. Developers will know the best how to assist you!