You can’t say that it lacks ambition. Ian Dunt’s “How to be a Liberal“:

tells the forgotten story of the advance of liberalism and the events which led to its current retreat.

And, by and large, it succeeds. I’m not qualified to say how complete it is — he may have missed out half of the story for all I know — but from Descartes to Mills, to Keynes, Orwell, Trump and Brexit, the history is here, right up to events of 2020. It’s well researched and mostly easy to read¹. Having heard the author on various podcasts, I might have expected more swearing.