CLS issue, and Unused CSS issue

Hello there guys,
My problem is somewhat similar to this post (https://github.community/t/how-to-get-rid-of-unused-css-java-script-without-any-plugin/124475)
Additionally, I want help to resolve my CLS issue (search console) for https://glintylab.com/. I am using GP-premium theme and Candance blocker.
Can anyone suggest some coding? I don’t want to use any plugin since my hosting is a total crap.
Thanks,