Echoes of the Fall by Adrian Tchaikovsky
I absolutely adored Adrian Tchaikovsky's Shadows of the Apt series. From what I can gather his Echoes of the Fall trilogy has ties to that world, so I'm really excited to get to these.
The Broken Earth by N.K. Jemisin
The Fifth Season was one of those exceptional books that completely drew me in with its unique use of viewpoint and slowly unveiling the complexity and cruelty of its world. I've been waiting to get my hands on a physical copy of The Stone Sky before tackling the rest of the trilogy, but with things as they are I might just have to get an ebook copy and dive in.
Mistborn by Brandon Sanderson
Yes, it's true. I haven't even read the Mistborn trilogy yet. I hang my head in shame. I have owed the box set of this since 2013 and while I'm not sure why I haven't gotten to it them yet, I will get there. Eventually...
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Which trilogies are on your list?