I'm familiar with Graeber, and I have a copy of that book. Graeber has heavily influenced my views in multiple ways.

This post was concerned with socialism, not anarchism in particular. I rejected anarchism for different reasons. Socialism is defined in terms of the system of property. I reject socialism because I don't think it really matters, so long as government policy brings about distributive justice. I reject anarchism because I think government is necessary for solving certain major problems. Cap & trade and Pigouvian taxes are needed to deal with the ecological crisis. Plus, I think land value tax (annual ground rent) and a citizen's dividend large enough to constitute a universal basic income is the best way to achieve distributive justice. And I want universal healthcare. It's hard to reconcile some or these taxation and redistribution policies with anarchism.

I think social democracy can actually be a much stronger position than the others. Social democracy started as a form of libertarian marxism. (Cf. Eduard Bernstein, Fabian Socialism, etc.) Early social democrats had studied both marxism and anarchism, so Eduard Bernstein and George Bernard Shaw were both familiar with Proudhon and Kropotkin. In fact, Annie Besant—a notable Fabian—started a news paper with Peter Kropotkin. And the Fabian Society even held a series of debates to determine whether they would advocate democratic socialism or anarchism. Check out Shaw's "The Impossibilities of Anarchism." It shows a clear understanding of anarchism and a valid critique. William Morris' "Socialism and Anarchism" has a similar theme...both worth reading. Ultimately, social democracy forged its own independent identity as a third way. And Eduard Bernstein had already begun that process of reform while Marx and Engels were still alive.

I think the ideas of Yanis Varoufakis, Guy Standing, Scott Santens, and Martin Farley are better than socialism/anarchism, and their positions seem to be a variety of social democracy, harking back to Thomas Paine rather than Anthony Giddens. Incorporating land value tax and basic income into social democracy makes it much stronger.

Also worth checking out is the market socialism of Oskar Lange, Abba Lerner, and Fred M. Taylor...and the "RICH economy" proposal of Robert Anton Wilson. I think a more social democratic approach to solving the problem of automation can be achieved through land value tax and emissions taxes and such being used to fund a universal basic income. There's no need to nationalize industry then. You'd have social democracy rather than socialism.

For a more detailed account of the history of social democracy and its relation to/departure from socialism, see my articles:
(1) The History and Future of Social Democracy
(2) The Brilliance and Tragedy of George Bernard Shaw
(3) Third Ways
(4) Distinctions and Similarities... This last one discusses how third way philosophies and socialism can overlap and blur together.