The Instagram app itself offers a basic zoom function. You can do this by using two fingers to zoom in on the image, pinching to zoom in and pinching to zoom out. However, keep in mind that this method is limited and will not be sufficient in all situations.
For a better Zoom experience, you can use external applications and tools. There are various apps and websites specifically designed to make enlarging Instagram photos easier. Some of these tools also offer additional editing options to improve your images.
When enlarging Instagram photos, the image quality may suffer. Make sure the image is uploaded in high resolution for a better zoom experience.
Go to your Instagram profile, tap your current izoomyou profile picture and select the replace option.