We need to optimize the site

You need to increase the speed of the site and optimize it. You can also view the recommendations on PageSpeed Insights, use them in your work:
developers.google.com/spe...

The project is not a one-off, designed for the long term, as other features will be added to the site. The budget is budgeted after viewing and evaluating the work of a specialist. We are looking for a competent optimizer who knows his job.