Instead of posting just boring old fonts on Instagram, you can use a wide variety of fonts for them. Also, you don't have to separate your paragraphs using dots or underscores.

Here are two resources that help you choose different fonts as well as to input a line break.

Line Break

http://apps4lifehost.com/Instagram/CaptionMaker.html

In the site above, you simply copy and paste your normal text and click on "Convert (& copy to clipboard)".  Now, you just have to go to Instagram and paste the text. This will then automatically add line breaks to your content.

Bold Letters

https://lingojam.com/BoldLetters

The tool above allows you to use different fonts for your Instagram posts/bio and also allows you to bold your text for greater visibility.

Using a combination of the two, you can create text that catches the user's attention.