This is not directly possible to send the second survey link automatically. However you can use the following workaoud/alternative: start by adding an email address question to the first survey, then enable the Thank You email option for it. In the Thank You email, include the link to the second survey, allowing users to click the link and complete the second survey after finishing the first one.
Helpfile : https://www.questionpro.com/help/email-address-question.html
https://www.questionpro.com/help/thank-you-email-notification.html