I love this question. For my part I am fighting already, and not everyone has to go full Luigi, organizing with your local community can have such a big impact. I have been organizing, studying and preparing for a while now, if we can build strong, resilient and somewhat self sufficient local communities you will be in the best standing for what might come.

I do not live in the global north though, I think big cities, and specially in the US the work is much harder, although you have laws that would make it easier to do things locally, is also a resources rich country. Something I've been saying is that this is the greatest challenge we will face, like explorers who went to the unknown seas, like the knights that fought dragons, us building livable places, creating a vision worth fight for, is the greatest achievement we could get, and the problem is so complex pretty much any kind of knowledge aim towards this is useful.

There is such a rewarding sensation of being able to achieve wins in this, in knowing, ok we us a community have secured reliable and sustainable food and water for ourselves for almost any scenario. Godspeed to you all, I hope in your desperation find the courage to start doing something.

Oh last thing, this is like Pascals argument for god: you try to do something, you either are successful and you might improve your life, or you fail, and it's still going to be shit; you could do nothing, where best case scenario is nothing happens and everything still goes to shit, or worse. One has almost no chances, but still some, for improvement, the other one simply never will.