First of all, we would recommend you to check the list of plugins that you use and disable plugins that you don’t really use. For example, do you use 360 products on your site? Then don’t keep the Smart product viewer plugin enabled etc.
“delete unused CSS” option could remove even necessary styles, besides it’s Beta version of the option. So, if it causes issues on your site then it would be better to disbale that.
Update theme to latest version. We made a number of speed improvements in 8.x version of our theme.
Optimize images of your site, https://tinypng.com/ is a great tool for that (this service also has plugin for these purposes).
Enable Lazy loading for the images in the Theme Options > Speed optimization > Images loading type.
What problem and with which script do you have?
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.