Hello, Alex,
1/ Try to use only one cache plugin, as using multiple may slow down the website.
2/ Do you have any regular cache or backup processes in place? It may slow down the site.
3/ Try to use Content Delivery Network (CDN): A CDN is a network of servers located in different geographic regions. By using a CDN, you can store your website files on multiple servers and distribute them to your visitors from the server nearest to them
4/ We’ve changed these settings on your site https://prnt.sc/K0cTRvirxs_t to https://prnt.sc/wAsO2bm61KKf (Theme options > Speed optimization).
Kind Regards,
8theme team