The home button is not working

If you purchased one of those few $ worth buttons you probably bought a purely cosmetic one, used only to literally fill the hole in the screen, that’s all. Unlike in previous iPhones the home button doesn’t have a click function, it’s a pressure sensor paired to the CPU, so either it’s original or it doesn’t work at all. There are in the market some workarounds from a couple chinese suppliers, one is a bluetooth paired button from JC, others are flat cable powered workarounds from JC or HX, that are known to be more reliable. That’s what you have to look for if you want to get back at least the return to home function.