This is what I do. I don’t like DRM in games that I own, and even just today I was helping a user that got blocked from playing a game that they own because the EA DRM breaks itself often on Linux. I wrote a Linux-specific guide for it but the procedures should also work on Windows with some imagination. The exact methods may vary per game but for the vast majority of Steam games you’ll only need to crack Steamworks API protection off of it.
(warning: guide is long. Sections 5 and 6 are the most directly related to actually cracking popular DRMs off a game)