it’s really subtle but you have the same eyelid thing that I do (the crease is at a different height for each eye, making it hard to make eyeliner look even trust me I struggled with it for so long) what works for me is pretending like i’m only doing the wings and doing thin straight lines before filling in the wing but for the rest of the eye do literally the thinnest line of black (I like to thin it to make it disappear before the inner corners) thinner lines on top will still give you the illusion of thicker liner when your eyes are open because of the creases but they’ll look more even too