This may sound like a no-brainer, but I have to suggest it! Ask a stranger! I know it’s odd and sometimes more comfortable to try to struggle and take our own shot but the quickest way to get a quick snap is to politely ask someone near you to take a photo.
Not sure if they’ll capture the image you envision? Politely show them from what angle and height you’d like the photo taken. Then, offer to take theirs! It’s good travel photo karma!