I hate to break it to you, but as a resident of the former military and economic superpower, having a super wealthy elite class and a dirt-poor underclass is a feature of being said superpower.

A well-fed and housed underclass has no need to volunteer for a large enough military force to be present anywhere in the world within, these days, 48 hours.

And your elite hoarding the wealth in assets they trade and speculate on the stock exchanges gravitates more money into said exchanges from across the world. Without their capital invested in said markets they’d merely be competing with other markets around the world not dominating them.

My advice, enjoy your empire whilst you still have it and do what you can reasonably do to financially prepare for when it starts to dwindle.