Uneven eye position, one eye is higher than the other. How can I correct it? (Photo)

It is not possible to fully evaluate from this picture and in person examination would be necessary. It looks like you have uneven eyebrows, and often correction of brow asymmetry can make the eyes look more symmetric.  If the eye position is asymmetric due to asymmetry in your bony orbit, that would not be correctible.

ozkliopi  thank you for the picture and questions.   An in person consultation is necessary to determine your best course of action.  The entire face must be evaluated.  From your picture alone  the marginal reflex distance ( light on to pupil) appears symmetrical  to both upper and lower lids.     The presumption that the line is drawn horizontally must be  evaluated in person