I would do what I suggested earlier, which is establish what used to be called a royal commission.
I think we need a national general review involving everyone in a relatively independent capacity to advise the government.
Asking public servants to review themselves isn't always fair. People will try, but it's better for this to be done by people at arm's length.
I think we need an independent national commission of inquiry to review everything. Once that's done, the government will have to decide how to handle any resulting recommendations.
I know people don't really like royal commissions because they're expensive and take a long time, but sometimes you don't have a choice. After all, we've been talking about emergency management in Canada for two decades, but we haven't made much progress.