Depends on what trim level you have. Do you have this one?
If so then you can get almost any aftermarket and it will work with a PAC or Metra Steering Wheel control module. If it's this one
then you can still do the same BUT you will lose out on the separate controls. There isn't any major aftermarket stereo companies that will give you back full control of your separate controls as that is on own its circuit. Even if you add a steering wheel module no company makes that here in the U.S. Now there is a light of hope you can go to AliExpress and take a chance on those head units which say they will 100% work like this one 226.2US $ 61% OFF|TEYES SPRO Plus For Hyundai Sonata 7 LF 2014 2017 Car Radio Multimedia Video Player Navigation GPS Android 10 No 2din 2 din|Car Multimedia Player| - AliExpress I know because I've been looking for an aftermarket unit as well for my 2019 Sonata.
Also, look into installing this sound processor visit this site LC8i | AudioControl and it may be able to help you out. tjis is the route I'm taking since I've already upgraded to Kicker 6-3/4 2way front and back and I have a 4 channel amp. Hope this helps