Start beeing as selfsufficient as possible. Some things i have done with my family of wife and 4 small boyes: Home gardening, wandering in the wild, testing life without electricity, testing low cost solar solutions.
Buy as much local as possible. Be active in your neighbourhood.
Go out and sosialize and talk openly and honestly about your situation.
Collecting silver coins as hobby. ( Silver is relatively cheap and gives better intrest than any bank.)
See youtube etc cites for beneficial “garage projects” Like home made wind, solar etc energy solutiins.
Tell your wife and children about your familys financial situation and possible future needs for saving.
( My kids were eager to live without electricity when I promised them 50% of what we could save.. :o)
Here were some things i have done. I still have my buissness and good income. [^o)]
Weapons, weapons and more weapons. Whether it’s for hunting or fending off government/other violent people, weapons will come in handy.
Get a good long range hunting rifle, a pistol with a large magazine (like a glock or baretta 9mm), a semi-auto or fully auto weapon (if you can) that fires pretty fast, and a good assortment of knives (pocket, Swiss Army, Leatherman, switchblade/spring assisted, etc).