I'm surprised no one has mentioned Adrian Tchaikovsky yet. I rather enjoyed the Children of Time and The Final Architecture series. They both technically contain bits of Earth but should still fit into the conditions you're after.
This is my vote! Well, Children of Time trilogy, but I couldn't get into Final Architecture, after reading the first.
I'm curious what it was about Final Architecture that made you not continue. As I found myself hooked. Just looking to hear an alternate perspective is all.
I have a hard time getting into non-hard-scifi / space-operas. It felt like the rules were loose. Good read, but didn't move me the way Children of Time and sequels did. Ie, Children of Time felt like something Stephenson or Andy Weir would write; Shards of Earth felt more... I don't know. Almost satire?
That's fair. Thanks for sharing your thoughts on this!