(NFS) I need some ideas.

[Toasteds]

What should I do to continue this and make it larger?

 

[mrsean]

Yes

Helpful lol.....

 

[Cafe]

Multiply the pillars, with walls between, try to make it a KoTH?

 

[PilsCreations]

If you're going for a lobby or hub? I would recommend this tutorial by 4thewar http://www.planetminecraft.com/project/build-tutorial-33-steps-to-a-hub-downloadable-content/

Very easy tutorial step by step on how to create a nice lobby

 

[Boshns]

add some custom trees and a terrain maybe?