My site has been reducing in speed even with cloudflare

It’s like am not doing something right, my site send to be reducing in speed and performance even after linking Cloudflare to it. I even upgraded from the free plan to pro yet no improvement, please help.
This is the link to the site:

The vast majority of content on the site is not using Cloudflare and a number of the images appear to be pretty massive. Lots of opportunity for optimization.

Please how do I make all the content in the site to be using cloudflare and if possible please can I get instructions to optimization. Am a kind of new in the area