In "Carry felt a little less bold", the subject is obviously ‘Carry’. The predicate is ‘felt a little less bold’ in which the main verb is ‘felt’ and the subject complement "a little less bold". Some might consider "a little less bold" an adverbial modifying the verb ‘felt’. I don’t believe there’s a DO here for one simple reason that DO should be a noun or noun-equivalent which you don’t have.
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