I exported everything before I gave up Salesforce. I have multiple csv files but need only the Accounts and Contacts. Unfortunately, there doesn't appear to be a unifying number to link the Contacts with their Accounts/Companies, other than the integration available in the paid Hubspot versions.
I believe you've found the solution, but if anyone still needs help, you can import contacts on your own with Trujay’s Free Sample Migrationwith the help of Excel or CSV files.
If you’re not sure how to proceed using the Self-Service tool, get a Guided Service and we’ll do the entire project for you. Visit our Guided Self-Service Migration page and get in touch with our experts at firstname.lastname@example.org. If you have any other questions we are always ready to help. We hope this helps!