I feel like these questions are always personal. Some people don’t notice and/or aren’t bothered by light bleed. I’m the type of person that once I notice something, I can’t unsee it and it always bothers me. So if it were me, I’d exchange for another one if I thought it would continually annoy me and if not, just keep it.
LCD screens are not perfectly uniform, and a little "bleeding" and other imperfections are common. If you get a replacement or a different model of phone, it will not necessarily be any better. If light bleed bothers you, considering getting a phone with an OLED screen.
The title of this thread suggests that you have a more serious problem.