Learn about databases, both SQL and NoSQL. Almost every project comes down to having a sound understanding of data concepts.
Work on some Open Source projects that interest you. It will be an opportunity to learn from more experienced developers, produce something of value to our on your resume, introduce you to source control and help you understand how developers communicate around software development.
The most important is not technical. If you can't effectively communicate and prioritize any technical ability loses value rapidly.
(1) Build stuff
(2) Show people
(3) Improve it
Rinse and repeat ad nauseam