none of us know how to prepare for this. there is a broad general strategy that has some support from history, which is to lean into community ties and localization, but it is not something an individual can implement themselves. people say get out of big cities and shoot for a place with a population around 30k because this is the sweet spot for existing resources (big enough to have hospitals, infrastructure, some stockpiles etc.) vs. ability to adapt (small enough to be at least not impossible to keep supplied under 'involuntary degrowth' (compared to the NYCs of the world that have such high resource needs that they simply cannot function once the system loses a certain amount of capacity).

do what you can to be close geographically to friends family and allies, if you can, and don't linger in vulnerable cities, or if you must, stay flexible and be ready to drop plans and adapt. beyond that, do basic emergency preparedness stuff like you'd be advised to do in places vulnerable to hurricanes (dried food and ability to function through blackouts). but by that point you are already running out of ways to boost your chances further, unless you can get into an intentional community based around sustainable agriculture (good luck), like now.

we are all vulnerable. even extreme prepping, if done in an individualistic way (as opposed to founding a sustainable community of some kind), can only help so much over the long haul. somehow you need to make peace with this. grieve the loss of whatever future you thought you had instead and live and plan with the knowledge that we live in a dangerous crumbling world, not the post-history shopping mall/suburb that Americans thought we were living in. the only realistic goal is to 'bend not break,' but there is no way to avoid at least having to bend.

and I'm sorry kiddo, we fucked up bad. it's just a fact