Google takes time to index and ranks only top relevant pages. If your Instagram account is still not appearing, I would suggest you to link it from other platforms like Reddit, Medium and see if it helps. Also, if your account is new (created less than 4 weeks) give it some time.

Use Google to search for Instagram content. This will only work for public content—nothing private will appear in a Google search. Open Google and type site:instagram.com into the search field. Type a space, then type the keyword, username, hashtag, or other information you're looking for.

The easiest way to find out the details of an Instagram account is to simply visit their profile page. This will give you access to their username, profile picture, bio, and any public posts they've shared. You can also see their follower count, following count, and the number of posts they've shared.