My DH worked for years in public safety in Canada assessing emergency preparedness for just about every scenario including a zombie apocalypse, yes, we have an official zombie apocalypse emergency model in Canada because it's a great model for testing the resiliency of a region.
What I've come to understand is that the range of possibilities and types of fallout are just too broad to plan for, and they can change radically over time. You might prep really well for one specific kind of emergency for the early stages of it, and then be fucked for what happens a year down the line.
"Society" is a very, very complex system and changing variables within a complex system is tremendously hard to predict, especially on any kind of longer time scale.
The most resilient thing you can do to hedge against societal upheaval to have a lot of really great and diverse social connections and to stay useful in a variety of scenarios.
Wealth is determined by social constructs, so you can't really effectively protect your wealth when the social construct fabric gets damaged. There are just too many ways that just about any store of value could drop within a complex, global economic system if it erodes.
There are SO MANY scenarios where gold would essentially be useless.
This simple fact is that if the fabric of society starts coming apart, it's a silly goal to try and preserve the value you accrued within that system. A hell of a lot of folks more powerful than you will be trying to do the same thing and be way more successful at it at your expense.
You could prioritize paying off that property so that "they" can't take it, but "they" can take whatever they want. The "they" in a social collapse scenario can expropriate, imprison, etc, however "they" please, whoever the fuck "they" ends up being, depending on the scenario.
Maybe you spend a fortune on a bunker, gold and silver, guns, and non perishable food only for your area to get forcefully evacuated or become unlivable. And that one bag you're allowed to bring with you to the FEMA evacuation site might get you killed if it's full of gold bars.
Literally any scenario you can possibly think of, the hedge for it is also an liability in another, equally plausible scenario.
DH always says that the best hedge against the collapse of society is to live a life without regrets. But when pushed on this, we both concluded that the best hedge is to maintain skills that make you useful in a variety of scenarios, and to maintain really good friendships with a diverse population of people with a diverse range of useful skills and assets.
Basically, live a really rich life full of valuable learning and meaningfully human connection with a diversity of friendships, and your life with be pretty awesome while society is still stable, and you will be maximally hedged of/when that stability erodes.
And as FINate just said, therapy is your best friend for any scenario, because nothing in this life will help you handle more challenging situations than emotional resilience.