Here are some steps you can take to migrate an online store to a new platform:

• Prepare: Create a new account on the new platform, learn the interface, and configure your store settings.
• Migrate data: Identify the data to be migrated, clean it up, export it from the old platform, and map the data fields.
• Install: Install a theme and extensions on the new website.

You can also use a third-party platform migration app to automate the process. For example, LitExtension offers apps to migrate between platforms like Shopify, BigCommerce, WooCommerce, and Squarespace