Doesn't seem like selling and moving system is a wise idea if you don't know why you want to change.
At the very least you need to borrow or rent several different cameras and see which ones you like and if there is really any reason to move. Try to get your hands on a Canon, Nikon and a mirror-less (m43, Fuji, Sony) and see if there is anything you particularly like about them.
Are their lenses missing, is the Sony Flash system underwhelming, is the camera too big, too small, image quality issues?