If u see it tilted towards the bottom, try to look at it from bottom to up, and if u see it bottom to up try to see from the top to bottom (idk if that makes sense but thats how i find i can see them, tho ur brain quickly adjusts to the “default” whichever u saw at first), also blink…
The way I tricked my brain into seeing the other perspective is I closed my eyes, flipped my phone 180, then looked at the image again. The cube was now upside down, even after flipping the phone back while continuously looking at the image.