The things a person can do to help out this community...is to create and be a positive influence.
You're going to make shitty voicebanks. Shitty covers. Shitty music, whatever. You're going to have many ideas on how to further UTAU and many ideas for fun things you want to do with UTAU. Most of those ideas will suck, or be already done, or refuted, or just have a much easier way.
But...if no crap were made, then what's the point? It's like the perfect heroine: Sure, she always wins flawlessly, but it's so...boring. Where is the struggle that actually triggers the need for progress?
This is why creation is so important, even if you are bad at it. If you enjoy creating with UTAU, then you should try to focus your energies on that and trying to push your craft a little further each time, even if it is miniscule. Share your ideas with the world, no matter how bad they seem; you may have a breakthrough sometime.
The other part, which is much simpler yet very difficult at the same time, is to be a positive influence on the community. You want to be the person that people look forward to seeing online. Be friendly even to assholes, unless you truly need to throw the hammer down; Rather, don't stoop down to their level. Make friends with other UTAU users. While you cannot be friends with everyone, you want to be a classy, friendly sort as much as possible. Or, just simply: someone that people want to be around.
We all need encouragement as UTAU users. Many voices and songs go unnoticed. While only a few could be popular, a simple yet well-thought-out comment can really make a person's day. This is something I work on myself, honestly, being that positive force; I'm someone who is kinda avoidant.
That is my opinion on being a help in the community. I might seem too idealistic, but it is how I see it. Good luck to you!