Hello,
I would be glad to optimise your site.
I currently work as a Linux systems administrator for a French company that provides AWS managed services for companies in the CAC 40. I am also a RedHat Certified Systems Administrator and can certainly help you.
I can optimise your site within reasonable limits. Making use of a cloudfront will relieve your server from responding to static resources since these will be served from the CDN. Moreover static content can be uploaded to an S3 bucket to further decrease your server load. As regards to your database, have you tried optimising your tables and is there enough buffer for innodb ? Is http2 enabled ? And are you using php72 ?
I would appreciate working with you.
Kind regards,
Taranveer.