Someone here, forgot when or who, suggested these lovehandle things.
https://www.amazon.com/gp/product/B07NXZM2Y9
The larger one is 4 inches and is on my Oasis3 and the smaller is on my phone. Best accessory I ever got for my kindles. Its been on since August 2019 and hasn't moved or come off. Seems to stick really well to the metal body of the Oasis. Its on the thick part so it makes it so very comfortable to hold now putting some fingers in while the thumb hovers over the buttons. Takes all the pressure of the wrist. I have never had a cover on this O3. I bought one for the previous model O2, but rarely used it. I like the shape of it with the wedge and any cover just made it to heavy for me.
I might even have a picture saved somewhere. If I can find it, or if I can figure out how to post it here.
eta: As expected, I can't figure out how to attach the photo. Tried every which way and is always invalid. Trying just to post the link to my photo on the site itself.
https://imgur.com/EWv4Zbx