Hi @Lak, 

Thanks for joining our community, so glad to have you here! 

So to address your question, we have a great help center article to walk you through the process so you don’t have to restart from scratch (because who wants to do that!). It includes a list of common ESPs with specific directions for each one, personalized to your situation.

You can also get more advice from one of our Community Champions, @Bobi N. He wrote the article: Tools for an Easier Migration Process from Another ESP to Klaviyo. Let us know if other questions pop up! Have a great day :) 

~Chloe