I'd like to recommend Old Man's War, which is the first book in a sci-fi series. I read the first 3 books in the series basically back to back within 2 months and really enjoyed them. I'm in a similar spot as you and I'm getting back into reading after not reading much for the past few years and these got me back into the habit.
Not sci-fi, but anything in the Discworld series by Terry Pratchett is also a good (and usually easy) read.