Need best practices for collecting customer information - pricing plans

I’m having trouble with
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e.g. Wix Studio Editor, Wix Editor, Dev Mode, CMS, etc.

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What I’m trying to do
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What I’ve tried so far
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Extra context
I have a pricing plan attached to my website. When I search for contact addresses, it’s not there. Is there a better platform to use and move customer contacts to? I have had too many issues with Wix and had to move emails to another platform. HELP!