There are only ~80,000 coal miners in the US now, which is 0.06% of the full-time employee population.
[1] https://en.wikipedia.org/wiki/Coal_mining_in_the_United_Stat...
And you'll never be. You didn't learn from the lessons in the UK of the 60s through 80s when output dropped dramatically. It's taken decades of EU investment for places like the Welsh valleys to begin to recover.
Maybe that's why Toshiba thought it was a good idea to buy Westinghouse; that they could better manage American mega projects.
https://www.afr.com/companies/energy/the-new-nuclear-option-...
Solar and wind are cheap and are getting cheaper, which will make up for a lot of intermittency. If you want a career in energy, look into ways to exploit intermittent cheap sources. There's free money waiting to be picked up if you can do that.