I found this thread on iFixIT with quite a few tricks you could try.
But choose wisely and maybe take the phone to a repair shop or repair-cafe, if you are feeling uncomfortable with it.
Or this trick, that is linked in the above thread:
There are two (amazon) links to special tools and a glue solution
And here you find a list of repair-cafes
https://repaircafe.org/en/
If there isn’t one in your area, you might try looking locally, because I wouldn’t expect all those initiatives to be registered with this organisation.
And don’t forget to get some new screws (and be extra careful when taking them out at later times). 
According to iFixIT the screws (for the display) are Phillips #00 4mm long.
Edit:
In another thread someone linked to minischrauben.com for screws.
I am not sure about the width of the screws (for FP2 they were 1.4 mm; also from another thread)
Here’s the list of available diameters (stainless screws)