Personally, I try to take a very relaxed approach to the hobby as a whole. Unless I'm [i]really[/i] trying to get into some coolsy-cool stuff and write collaborative fiction at a high level, I use it more as a way to blow off steam and work out the kinks in my writing style, as well as help buff up my word choice and try different themes and voice for characters and worlds alike. It's a hobby, and in my opinion, it's a hobby ancillary to compelling narrative writing as a whole. Dealing with differences both in terms of creativity and skill level can be difficult, but sometimes you just have to breathe and remind yourself "hey, you know, they've got their vibe and I've got mine." Sometimes you can make your patterns and styles tessellate, but it's rare to click perfectly with someone. 

If you're having trouble with roleplays dying over and over and over again, it might be time to look at what your standards of writing are, or if the side hobby is even something for you at the moment. It's not like sports where you could get injured and be out of it for the rest of your life. You can take breaks from it and focus on things that make you happy, rather than letting it absorb all of your attention and time. 

But, in a similarly personal vein, I find the best way to get yourself out there is to put yourself out there. Show off the best of what you've got. Write pretty words, try original settings that other people just aren't doing--take advantage of the fact that you can just pull a concept from the ether and put it on a page. Hell, coming up with a new plotline and world wireframe every day or every few days or so is a great creative writing exercise. Work on what you're doing and ensure your demeanor is pleasant and casual, and I'm sure the posters will come. 

Rome wasn't built in a day, but hey, Minecraft lets you do some pretty cool shit in a pretty short amount of time. Don't look for your Rome. Look for your sweet gamer Minecraft house for gamers. ...That metaphor got away from me.