How to scale Character/ Sprite size relative to camera?,How to make sprite bigger towards camera?

Hello, So I basically have zero experience in coding but need to do it for my university project.

I'm making a 2D Point and Click adventure Game in Unity and I want that the Character to get bigger when moving towards the camera. The problem is obviously that the character has the right size when I place him in the back of the Background, but when moving towards the camera he is way too small since the characters size doesn't change.

Maybe someone has a solution and can it explain to me who doesn't have much knowledge about this?

Thanks in advance :)