Wordpress, Shopify and Wix website load speed optimization

Hi there, I am looking for someone to help me optimize the load speed of my Wordpress, Shopify and Wix websites. There are no existing speed optimization efforts in place and there are no customizations that need to be addressed. I am hoping to find an expert who can help me ensure these websites run with optimal load speed so they remain user-friendly and enjoyable for visitors and customers. If you have expertise in website optimization, I would love to hear from you! Finally what is need is Wordpress, Shopify and Wix website load speed optimization .