WordPress Security & Payment Setup

Need someone to make some quick, same day adjustments to my Wordpress/WooCommerce website. I am hosting a live sale event tomorrow Saturday 7/25 and need some design adjustments + optimizimations for fast site responsiveness maybe even advise on how to adjust server limits are able to accomodate higher traffic. Priority is ensuring that my site is not blocked by antivirus/security issues and can handle the increased trafffic so customers can buy. The ideal candidate will have experience in WordPress security and payment gateway integration. This is a part-time project with a short-term engagement. Candidate must be able to work on this project immediately as the ecommerce must be functional by 10 PM CST on Friday, 7/24/26.