Restricting the instazoom of profile pictures on Instagram serves to protect privacy and prevents unwanted enlargements that could potentially be used for abusive purposes.
The instazoom of Instagram profile pictures is not possible within the app because Instagram has deactivated this function for data protection reasons. However, you can take a screenshot and zoom in on the cropped area to get a closer look at your profile picture. Keep in mind that sharing profile pictures without users' consent can be an invasion of privacy.
The best way to get a closer look at profile pictures is to take a screenshot and crop the profile picture. This method allows for a larger view of the image.