The number one thing you can do to improve your odds of surviving WW3 is planting a garden. TPTB are already moving to restrict your ability to gather calories with bans on going into the woods to forage, fish or hunt, restrictions on fertilizer usage and gardening as a whole (Remember when they banned the sale of gardening supplies during COVID?). If you cannot supplement your calories, you will be starved into joining the military.

The people most likely to survive WWIII are the ones who are least reliant on the supply chain for their daily needs. The more calories you grow for yourself, the better.
>muh climate is shit
If you live there, plants can live there.