iphone 8 plus’s signal

hi! i used my iphone 8 plus for a lot of daunting tasks whether it’s gaming, work or even school. recently, i’ve been experiencing a lot of problems. the most noticeable one is that my iphone is losing wifi signal. how do you actually make it better again?

my iphone is in an okay condition with a slight bulge on the upper right corner (where the camera has to be).