How to delete sun refrection

I want to delete this refrection.

but I need same level brightness

This is not reflection it is not render of sun but result of lighting/shading model reacting to light source that is the sun.

Either reduce spectacular or increase roughness of your material. Set const nodes on inputs in material if you don’t have maps for those properties, if you have maps use divide or multiply node to reduce or increase the effect of the map.

Thanks! for your help