Hi, I have read your job description and seen the attached screenshot. To be honest, All of the issues listed can't be fixed. Because of some of the issue is fixed with your website design, and structure. It can be broke your website design and structure.
But, Most of the issue can be fixed and you will get a good speed score both gtmetrix and google page speed insight test.
I do not take a long for this task, Just 5-6 hours needed. and I am available right away.
I have completed several projects of speed optimization. You can hire me, I promise you, you will be satisfied with my work.
If you have more question, please let me know.
Best regards