I accidentally bent my iPhone 8 is there a way I can fix it

In my experience the only way to get it straight (depending on severity of the bend) is to buy a new back housing and transferring the guts of the bent iPhone into the new housing. I’ve done this before with good results. Many times when you try to bend back the housing you can cause damage and in the case of the iPhone 8 you have to worry about the glass back breaking as well.