Ensure that all the necessary information in your account, such as the "About Us" section, website details, contact page, and branding, is filled out. Also, ensure that your website caters specifically to your Pinterest audience's interests.
Create boards that are relevant to your audience and pin or repin images that are also relevant to their interests.
Maintain an active presence on your account, but avoid spamming. Keep your interactions genuine and authentic.
By following these steps, you will gradually build a suitable audience. Remember to be patient and put forth your best efforts.