Where are you based?
Other places you may like to try are:
Baen.com
Wildside Press
https://wildsidepress.com/ (they also sell through DrivethruFiction)
Open Road Media
https://openroadmedia.com/
BookViewCafe
https://bookviewcafe.com/
Smashwords
https://www.smashwords.com/
Also keep an eye on HumbleBundle (
https://www.humblebundle.com/books but can be geo-restricted), StoryBundle (
https://storybundle.com/bundle - mostly indies), Bundle of Holding (
https://bundleofholding.com/ - mostly RPGs but do occasional book bundles), and Fanatical (
https://www.fanatical.com/en/bundle/books)