The easiest way is to withdraw your money from the bank in physical cash and put it in a safe deposit box. It can’t be loaned out by the bank, and will slow growth. If you have any debt, pay it off now.
Do NOT put anything in bank safe deposit boxes! In a natural disaster it could be difficult or impossible to get to your bank and in a bigger crisis (think bank holiday) there’s nothing to stop the feds from taking whatever they want out of your “safe” box.