Deep horizontal line above lip when I smile. What is the best way to get rid of this without loosing speech and smile?

This line is not unusual and can be helped with low dose carefully placed Botox.  see a board certified dermatologist who is experienced in the use of Botox

there are different ways in which the horizontal upper lip line can be addressed. The anatomy and the cause of this deep line varies in individuals, therefore you should be evaluated in person or at least submit a photograph of yourself at rest and while smiling, as it will help greatly in your evaluation. Good luck from New York City