So I think a couple of general comments and thoughts... you tend to like keeping your poetic form quite strict - and I like that, I do the same. I find that keeping a strong rhythm and rhyme scheme is quite helpful for getting my thoughts into a form that works and flows well rather than just splatters on the page. That said, I think sometimes you could make the rhythm tighter and sometimes you could break the scheme more intentionally. A line like "Locking them away from anyone that may come too near." might want tightening given that the rest of the poem has quite a strong rhythm to it. You could do this by dropping or switching out some words: "To lock them away, safe from those that come near" I think might flow better with the scheme.
With the rhythms, it's often worth speaking your poems to yourself out loud and thinking about what are the natural points of emphasis. I think you do this well naturally but there are places where thinking about it explicitly can help: so for example in "
Around and around in circles again" - the yellow syllables are stressed, the orange ones are unstressed, which works pretty well. You wouldn't usually want words like "in" or "to" to become stressed because you want the more important syllables and words to stay in the reader's or listener's mind. In the above example of "Locking them away", the stress hits the "ing" as second syllable for example, which is why my rearrangement made it hit "lock" instead.
Tightening the scheme can also let you play with it a bit more intentionally. I'd be tempted with
Ouroboros to either drop the last word into its own stanza, so it sits totally separately and emphasises the potential breaking of the cycle-as-rhythm, or alternatively add a whole extra "Around and around in circles again" line at the end repeating the first line to suggest its continuity. Although maybe it's best to leave it less certain, but just to highlight that you'd have those options for trying to use intentional breaks in what you're doing to emphasise the theme of the poem.
Anyway, I really like these - ouroboros is probably my favourite of these new ones so far, it's such a good image.