If it's me against Russia, no, I can't plan and prepare. - ALONE. Ukraine spent several years after 2014 planning for another war with Russia and there had reasonable success despite being in a apparently much worse situation. Ukraine is a large enough collection of people that they could usefully plan and prepare.

Which is part of my point. Don't live alone. You live in a community of people. You need to engage with your community to prepare for that dragon.

That doesn't mean don't go play with your kids or whatever. Do that too. But also prepare for life in ways that you can prepare because you live with other people