How to reduce page load from 20MB?

Hi,

Whenever I run my site in Pingdom's page load tool, it tells me my site is almost 20MB in size. I have already ran WP Smush and even turned on the Super Smusher. It is still saying my site is 20MB in size. How can I reduce this?

Also, Hummingbird shows a 0 score because it tells me to optimize my images, so I click on to fix it, and it says to configure WP Smush, and so I click on that, and then WP Smush says I have no images to smash