Alan Dean Foster's Splinter of the Mind's Eye was the original sequel, before they had budget. The Brian Daley Han Solo books, L. Neil Smith's Lando Calrissian books, and Mike Stackpole's X-Wing books, are all pretty good. Daniel Keys Moran of The Long Run and more recently AI War/Time War fame, wrote a few short stories.
Almost everything else I ever even read a couple pages of was so awful I threw it down. These were all written long before Disney got hold of it, and nobody really cared much about canon. Modern stuff would be corporate pablum.
Overlord, if you're lucky you'll just be ruled over by monsters that treat Humans as "sheep" to be bred, sheared, & slaughtered. If not, you'll be genocided by a cute little Elf, hee hee. Only hope is to find some way to be useful, and get converted into a monster.
Sasuga Ainz-sama is justice.