Audit and clean up a WordPress website code

I have a new WordPress website. It has zero clients, zero orders, and zero operations going on. Yet, its size is already 4+ GB Add to that, it has a supplementary blueprint that is 2+ GB of size I believe this is too large... (Budget: $30 - $250 CAD, Jobs: PHP, Website Audit, Website Optimization, WordPress, WordPress Multilingual, WordPress Plugin)