Now I'm a junior, how to become senior faster? :)

Question

Hi! 

Right now I am working in London, as the Junior .NET Developer. After graduating (bachelor degree in computer science) I had 3 months internship, then 3 months I was working as Graduate Developer and now I am working as Junior .NET Developer. For the last 4 months I have learned more deeply C#, ASP.NET MVC patter, WebAPI, more LINQ, using NHIbernate and Entity framework (both with MS SQL +and of course sql language), dependency injection and basics of TDD.

Can I get some advice how to become better, what I should learn next and how to progress quicker? :)

Kris