Does anyone have an idea?

I am looking for a way to make a data connection between a visitor's info in Zoho Sales IQ and a contact's info in Zoho CRM manually.
Because, I found out that some visitors in Zoho SalesIQ are the same people as some contacts I have already made manually in Zoho CRM, but they are not linked.

In order to solve the problem above, I tried a way below, but I don't think that I can make a data connection betweem them correctly.
Because, the visitor's row doesn't have Zoho CRM Contact ID on Visitors(Zoho SalesIQ) table when I checked the table in Zoho Analytics.

<The Way I Tried >
1. I added an email adress on a visitor's page in Zoho SalesIQ manually.

2. And the visitor's info was automatically linked with a contact in Zoho CRM who I made manually, because of the same email adress.

3. Therefore, I could check his visitor's info on Contact Module in Zoho CRM.