Can there be ways to fix/treat colorblindess?

Not fix: There is ni way to permanently remedy congenital colorblindness. Some types of colorblindness may be imporoved by wearing a red colored contact lens in the non-dominant eye.L.

None so far: Color deficiency is due to a change in the spectral range of one of your retinal photopigments. There is no way currently to undo this. A red lens is sold claiming to correct color deficiency, but this merely shifts the axis of confusion to a new axis, allowing you to pass a test plate you might miss but then you will miss others due to the shift.