Hello,
We have tested your website and found a few problems that you should fix first to speed up your website.
1. Your home page size is 6MB+ which is too much. It may be due to large not optimized images, JS, CSS files, plugins etc. https://gyazo.com/28565ca6873ff3e2f1381432b2bfc6cf
2. Turn off all third-party plugins first and optimize your website. Then, add necessary plugins one by one and check the speed accordingly.
3. Use WP Rocket plugin to optimize your website’s JS, CSS and cache.
4. Use some CDN service like KeyCDN.
Kind Regards