Is it safe to create a child theme after you’ve already made lots of progress with the original (parent) theme?

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So I’ve already developed most of a page, and now I’m like “wow pretty dumb to not use a child theme” since I wanna modify a plugin’s code.

Can I still create and use a child theme now? I haven’t modified the original theme’s code (GeneratePress), but made tons of Custom CSS and individual settings via its customizer. Is there any chance to lose that if I switch to a child theme?

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