Again, a good beginning. I really like the way you put the last stanza. It flows well and still says what it needs to say.

I have said this to others and now I'm passing it along to you for what it is worth. This is how I approach rhyme. For me it is like an immense jigsaw. Finding exactly the right piece in exactly the right order to say exactly what you want to say in a poetic phrase is the challenge (at least for me).

When working a poem in rhyme I find it helpful to sometimes restructure a sentence so that the words that rhyme fit better. An example might be - I stand well back from the cliff and ask the question, "What if?" or From the cliff's edge I stand well back, Courage to move forward what I lack. (last one is clumsy but you get the drift)

It really helps to have a good synonym finder and a rhyming dictionary. Don't be afraid to lengthen your lines when you need to in order for them to flow.

Good luck!