Possibilities of what your problem could be…
# You broke your phone’s glass, but the touch is still working.
# The phone is not showing anything on the display, but the digitizer works
# Something that is not on this list that needs more specification
Either way, you are looking at a screen replacement. I don’t advise replacing the LCD only because the glass and the LCD are fused together. (you'll be swearing until the swear jar is full)
[guide|51719]
https://www.ebay.com/itm/OEM-Amazon-Fire-Phone-SD4930UR-LCD-with-Digitzer-and-Frame-ORIGINAL/272944560241?hash=item3f8cc37871:g:vmcAAOSw9VJa43l5:sc:USPSFirstClass!80516!US!-1