buy more? kidding as that is just the stupid go to answer :D
looking back, not a lot that i would change. i could have done "better" with rewards in this 3+ years, could have posted more... but it is not a job and most probably never will be, so having fun and learning is most important. Also for noobs, try to find a community that you are into, that is the only way to stay on the platform and have fun (now we have communities)
also find projects that you like and try to help out.
and don't be a jerk.