Around Ludum Dare #38, I came across two great portfolio tools: Unity Connect and Itch.IO. The combination of the two can help your Unity portfolio grow overnight. The general idea, is that Itch.io has a great system for uploading and sharing WebGL games (and other downloadable forms), and that Unity Connect has a great system for sharing projects over all.
Next, with the game live and playable, add a new project in Unity Connect. Add a thumbnail, and have a separate thumbnail for the WebGL playable. (I.e. something that says 'play now' or similar on it.) Add any other content, and be sure to describe it for what it is. Was it a Proof of Concept, where you are focused on one key element? Was it a starter test project? Is it actually released somewhere? Is this just level 1 of a larger pay project? Is this part of Steam Greenlight?
The more items you have on Unity Connect, the more your profile will stand out. Keep it up.