I just finished the third book in the Thrawn prequel series Thrawn Ascendancy: Lesser Evil. It was the best of the series to me. It has me jumping right back in to the Thrawn series again with a renewed interest. They managed to do the prequel thing while adding a ton of character building and motivation outlining for Thrawn and many of the other characters.
Thrawn is due for some live action screen time. He is the best character the Star Wars franchise has going for it right now. Six canon novels, some smallish appearances in some of the CGI series stuff, and the shout out in Mando season 2. This dude is out there somewhere up to things. Lots of ways to go with his story.