The Czar Bomba was a one off made in the 60s by the Soviets that cost a fortune. It was made so big because the accuracy of the delivery systems was so poor, they needed a big footprint to guarantee a destroyed target. They don’t make them anymore and have not since long before the Soviets fell.
The “mine’s bigger” game is just a game. Today, be afraid of how close they can target something worth hitting.
Over the many decades advances in delivery systems whether hypersonic or cruise missiles or ICBM/SLBM systems or stealth aircraft have made a much smaller warhead/warheads the most cost-effective nuclear weapon to produce and maintain, which in itself is a hard struggle.
Nonetheless, our deindustrialization and the dreadful condition of American education stand in stark contrast with our adversaries. Both China and Russia are better equipped to sustain a long war than we are. Russia has been waging a World War I style conflict for 20 months, despite the contentions from the mockingbird press that they are on their last legs. Can we even produce the basic materials for waging war?
China turns out multiples of engineers to our own. Despite having half our population, Russia produces more engineers than we do. You cannot win wars on self-esteem and windy, tiring propaganda.