How do I fix black screen issue on my iPhone?

My screen is black as if it was off but my phone is on I can hear when I get calls and take screenshots it all started when my phones screen started to not work on some areas so I would have to press extra hard on it for it to work, I decides to delete all my photos and unnecessary apps because I read it could be because of the storage, it started to work after I deleted this one app it was ok until about three hours later where my phones screen turned black and only started working when I used to siri to make a call where everything went back to normal . Today it has completely turned black and won't get fixed pls help me by giving suggestions on what I could do

[Re-Titled by Moderator]

Original Title: My screen is black but my phone is on