Write the worst poem you can possibly write. Use clich 's, pretentious words, and beat your reader over the head with your point. Now get back to work. The point is, don't be afraid to write a bad poem. If it takes a hundred bad poems before you can produce a poem you like, fine, get that hundred out of the way.
Dirty limericks can be fun too.
That one perfect line in a thirty line poem may be what makes it all worthwhile, or it may be what makes the rest of the poem bad. Keep an eye on it. Every great poet has written a bad poem, probably dozens or hundreds, possibly thousands. They kept writing though, and so should you. Every line of a poem should be important to the poem, and interesting to read.