I'm in an extremely similar position, so it's a bit rich me giving advice, but I would suggest just trying to make something, something that seems perhaps slightly too complex. Then look for the specific resources you need when you run into issues; not something general purpose that just happens to be at your level.
(Not least because it frankly probably doesn't exist? We'd need something graduate level but with a refresher of basics, who's writing that? And we're not necessarily interested in graduate level in the sense of the mathematical theory of it any more, depending what we're building, if the goal is just to make stuff. E.g. I can use a USB PD chip in a design without learning more about transmission line power loss.)
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I'm in an extremely similar position, so it's a bit rich me giving advice, but I would suggest just trying to make something, something that seems perhaps slightly too complex. Then look for the specific resources you need when you run into issues; not something general purpose that just happens to be at your level.
(Not least because it frankly probably doesn't exist? We'd need something graduate level but with a refresher of basics, who's writing that? And we're not necessarily interested in graduate level in the sense of the mathematical theory of it any more, depending what we're building, if the goal is just to make stuff. E.g. I can use a USB PD chip in a design without learning more about transmission line power loss.)