Fix my wordpress with woocommerce very slow website

Hello , I’m the owner of website [login to view URL] . I need to find specialist linux admin and specialist wordpress with woocommerce who can find out and fix my problem . Let me show you what’s the problem of my website and what’s the plugin that I’ve use and install on wordpress . About my cloud server 1. I’ve hire cloud server from [login to view URL] . Spec of cloud server is “High frequency compute” with 1024GB SSD , 8CPU core and 32GB of memory . 2. OS is ubuntu 18.04 x64 3. Nginx with php-fpm as webserver . Mysql as database . Php 7.2.15 . 4. Cloud server was locate at Netherlands . 5. I’ve use cloudflare as my CDN provider ( Pro package ) About my wordpress 1. Wordpress version 5.2.2 2. Use WPML for multi language website . At now has two language . It’s Thai & English . 3. Woocommerce shopping cart with SUMO Reward Points and SUMO Discounts . 4. YITH plugin for product dynamic pricing . 5. Terrawallet for customer e-wallet . 6. SUMO affiliates for affiliate program . 7. EWWW image plugin with ExactDN for image compression . What’s the problem that I faced ? 1. Very high cpu usage . I’ve by only one customer access to website . It’s consume all of cpu . ( Check attachment ) 2. If we’ve about 10 concurrent view , Website is seriously slow and sometime go down . 3. First page loading is super slow . It need about 5-7 second to load . 4. When customer click add to cart it need about 5-8 second until cart was update . 5. Overall of my website is slow . But it’s happen only with wordpress . I’ve other sub folder and run other script . It’s fine . So anyone who can help me to find out the problem and can solve it . Please bid on this project . Authentication for access to wp-admin , ssh credential will provide later . PS.- Only linux admin who has experience with woocommerce is prefer . PS.- I'm not use GTmatrix or Google page speed to check the result . But I will check one by one from the problem list above .