I find the best thing to remember is that meaning always trumps rhyme. If you can’t find a rhyming word that says what you want to say, look for a near rhyme, or just don’t rhyme. Poetry doesn’t have to rhyme. But if you want to try again with the rhyming, I recommend a rhyming dictionary or a resource like RhymeZone.com. They can help find the right word that sounds right.