Check out 7th chord extensions like say Bb13 to Eb9 to F#9.
Dim7 chords never hurt either.
Hear more of your favorite jazzy-blues guys for more chords. Straight up blues guys usually use just the 7th and 9th chords with a Aug chord for the 5 chord now and then.
Guys like Robbern Ford, Larry Charlton, Matt Schofield, T-Bone Walker, John Mayer, Jimmy Thackery, John Schofield... Learning music theory helps a whole lot too~
Yes, chord voicings are what your looking for~
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