Optimizing of a slow website that we have

Looking for someone who can optimize my little wordpress website. the website is bit slow. VPS Server Configs 8 cores vcpu 16 gb ram 500 gb ssd PHP 7.0 Maria DB Apache 2.4 Website is taking so long to open, database is huge because we installed ICL / WPML Translation Plugins wp_postmeta contains 1,975,644 rows wp_icl_translations contains 145,604 rows wp_post contains 144,413 rows I believe that If we do some database optimization the problem will be fixed (or not). Or if required installing of any cache module to server or plugin into wordpress.

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