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Study finds 268% higher failure rates for Agile software projects
(www.theregister.com)
This is a most excellent place for technology news and articles.
It's very likely that as a sole developer you are actually practicing agile as it's intended and not corporate "agile".
There isn't a problem with agile there's a problem with it being mislabeled and misused as a corporate & marketing tool for things that have nothing to do with agile.