We have tested your website and found a few problems that you should fix first to speed up your website.
1. There are some errors loading resources on your website. Probably, they are caused by your hosting server or installed plugins. https://gyazo.com/d63cfb3b18b46763e1a18f3a2e695957
Also, you need to check where you uploaded this image. Most likely you just need to reupload this image.
2. Use WP Rocket plugin to optimize your website’s JS, CSS, and cache.