There is a default automation rule in Freshdesk, which assigns tickets to the first responder, automatically. Navigate to Admin > Workflows > Automations > Ticket updates > and enable the 'Automatically assign ticket to first responder' rule.
You can change the order of the rules added by following the steps mentioned in the video
https://www.youtube.com/watch?v=Gt2VWBeuBU8&list=PLsYJ3BsyR4qGFujlW0iDtOBOf4IPVsAqt&index=14