Congrats.
What's next?
Maybe Mt. Evans in Colorado? Not long, but a fairly constant 4.5% grade for 27 to 30 some odd miles depending on where exactly you start. And the views must be fantastic from 14,100 feet.
https://www.mybicycleroutes.com/xmtevansinfopage.html
https://pjammcycling.com/climb/50.Mt-Evans