¿Qué significa I'm only as good as my last piece ?

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@jimimibear No, I guess the 'piece' is an article or some writing from the work which the speaker is talking about. The part of a sentence is from my listening test material and below is some of it(that part of a sentence is the second line from the bottom.):

Int: Now you’ve both recently published novels – is this a change of
direction?

F: People keep asking that. I like to think that, .....


M: Well, I expect there’s people who’d say we should stand aside
to give up-and-coming writers a chance. But, no, I’m not. I’d
go along with the idea of diversification keeping you nimble
though, and I’m not making great claims for my novel either.
But I would take issue with the idea that journalism itself holds
no further challenge. I wish I had your confidence Jenny – I’m
always telling myself that I’m only as good as my last piece and
there’s no room for complacency.