@Bernard
You're right, extinction is the greatest threat but it's also a choice.
The biggest hurdle is you can't convince, negotiate, educate or even coerce women into having children. They naturally don't want them and, like Aaron Clarey concluded, they don't really like men that much.

The only way to address the issue is to force women to have kids, either directly or indirectly by removing their rights, choices and autonomy in society.

Everything else is pointless, waste of time really. 🤷‍♂️