How could I fix my screen protector?

Hi folks,

I have a fairphone4, with the screen protector. I put it my self, and it was not great. After 2 years, the screen protector does not stick anymore to the phone. I saw that there is machines to make sure the screen protector stick to a phone, but I wonder if sometimes there would be any ways for me to remove it and stick it again at home.

Thank for support