Well I think you need to rewrite it in the same style as the other stanzas or rework the current one because 4th stanza has the "But now" which compares it to something.  I like the contrasting style of the 3rd stanza, the rhythm reminds me of a...

Hi Ling, thank you for reading the poem ^_^ I will remove the middle stanza then?

The rhymes caught my attention, but the self reflection propelled me to read from beginning to end. I like this poem but I think you could do without the middle stanza which seems trite and forced.