Consider adding a large-scale and ongoing bug bounty program. I believe DFINITY now has a responsible security vulnerability disclosure process, which is one excellent step in the right direction. But I think DFINITY should also allocate a large amount of funds towards rewarding those who responsibly disclose security vulnerabilities. I think this program warrants multiple millions of dollars towards responsible disclosure.
I am not confident the system is secure when it has only been looked over by members of the Foundation, or those close to them (I assume this has been the case, I could be wrong).