Hello, @Diana Nikolova,
I have checked your site speed on mobile. It is 53% now. There are some necessary things those must need to optimize to increase the speed of your site on mobile like “CSS, serve static assets, Eliminate render-blocking resources” See image: https://postimg.cc/Lq2hSns3
General site speed depends on many factors. Especially, for the mobile below listed all the techniques to improve your mobile score.
Enable Mobile Caching
Optimize Images for Mobile
Implement Lazy Loading on Your Images and Videos
Optimize Image Delivery With a CDN
Improve Time To First Byte
Eliminate Render-Blocking Resources (JS and CSS)
Reduce Page Weight
In order to understand how you can fix it please read this article:
https://xstore.helpscoutdocs.com/article/39-main-theme-options
https://xstore.helpscoutdocs.com/article/100-how-to-speed-up-my-website
https://wp-rocket.me/blog/how-to-make-your-mobile-site-load-faster/
It will help you to optimize the site speed.
Regards 8Themes Team.