Why all the emails from Automations landing in Spam?

I have removed the spam words from subject line and email content, especially the automations mails landing in spam, when I tried inserting only image in content, it’s landing in the section like promotions, social in gmail. BTW the brevo account which I have created is new, where i m builiding a email list where they will get new letter a week through brevo automation, surprsingly there were not any response, when I tested with my own emails, it’s having above such issues. provide me a solution