Hello sir, I will do all the changes you stated, first I will test them on my local server before testing on your site, and even before testing on your site I will take complete backup of your site, I will do all the changing one by one and will send you the report after each task completion so you get satisfied before I move on to the next one, I will speed up your site and will make its score 90+ on tools like page speed insights and GT matrix, I will update all themes, plugins, optimize all images and minify your css and javascript, I will add drop down, will d\add the required payment gateway and will make sure it runs faster on all browsers, I will send you the speed report before and after optimization so you can see the difference, Thank you have a nice day