Aside from Instagram's insta zoom built-in tools, there are also external software and apps that can help you with image optimization.

Adobe Photoshop is a professional image editing software that offers a wide range of functions. Photoshop allows you to tweak and customize your images down to the smallest detail.

Instazoom.io is a popular online design tool that also offers image editing features. It has an easy-to-use interface and a variety of templates that you can use to enhance your Instagram images.