I haven’t been gaming much lately, and I’m a smidge under the weather, so this will be brief.
When playing any role playing game, either as player or game-master, keep an eye out for bits of creativity from your fellow players that you can hook on to. If a group is going to create a world that feels developed and real, it will take all of your brains and all of you will need to participate. Otherwise, you may wind up with five completely separate and parallel stories surrounding your adventure. There are certainly worse things, but if you find ways to interweave your creative minds, you’ll find that it all hangs together in a more satisfactory way.
Along with the idea of hooking on to the stories of your other players, support your other players when they want to add content to a story that you’ve created.