I assume in terms of incentive, there are more reason for Spanish speakers to learn English than English speakers to learn Spanish. Likewise most Spanish speakers within the US tend to keep to their own communities, and you're unlikely to directly interact with them unless you are friends with people in the group, or frequently do business with people who speak Spanish.
It's kinda like Russian and its bordering Countries. Many people in Kazakhstan can speak Russian, but not many Russians can speak Kazakh.
And good luck with your language endeavors as well. Japanese does get easier the more you interact with it. I am at the top of my game when I'm watching and reading media constantly.