How do I do i get my sprite to walk left longer?

I managed to figure out how to get it to move and turn like the Koopa troppas do in Mario but now it's ping-ponging back and forth.

would anyone know a way I could have the forward motion last longer before it turns around?

I followed the tutorial on this website on how to turn the sprite.

I would add a file to show what I mean but I cannot figure that out I apologize.

Depends how you made it, show us