Hello, I have been testing your website and I couldn't notice any speed problem neither in desktop nor in mobile, however I can help you to create a faster website by reducing the frameworks you are currently using, also, I can also help you to give the entire site a better look by making a redesign of some elements besides helping you with the ongoing maintenance and design of any promotional material, we could add intros to your videos and make more, well I can help you with a lot of stuff but again, I don't see any loading speed problems.
I usually work with the Divi theme and if you are planning to migrate your website because you are changing hosting provider I think I could make you a brand new site, based on the current one and it would probably load faster, Divi is a very good performing theme..