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I think these are awesome goals that I have too, I entered a few competions hosted by the site never by another writer, which one were you refering to? I personally write alot but nothing great, really so I get that.
Put aside a bit of time each day with the site, don't work on a million things at once story wise and just anyway in everyday life, work on one or two things at a time and attend to other responsibilities first, don't stress too much or burn out.
I think you've got some nice goals here, I hope you keep up with them, they can really improve your writing and morale.