you can get locksmiths, change the locks, or make new keys. $300 million in wealth held behind one password is crazy if the individual dies, loses their memory, goes into a coma etc.
Discussion
Holding custody of your #Bitcoin is not simply putting it on a signing device and that's it. That's of course better than keeping it on an exchange. But there is a series of OPSEC that need to be learned , practiced and executed. As much as I have empathy for this guy, such news are an opportunity to raise awareness for better education and better custody to reach proper financial sovereignty.