First off I would look at some songs you like, that are slightly more challenging for you. (If you don't enjoy the music your learning you're not going to keep up the practise). Maybe you need to learn some new techniques or types of chords to be able to play these songs. Barre chords are very useful.
I also think (as stated earlier in somone elses post) that playing with others is really beneficial. You can learn alot by playing with your friends, or even get new friends. It should also help neaten up your playing should you need it.
If the songs you have played are all chord based. Perhaps look into some songs where you need to learn riffs and scales? Obviously it all depends on the variety of music you like. Try some Red Hot Chilli Peppers, If thats your sort of thing?
Anywho, Best of luck!
DaĆ³