I’ve written a lot so far about walking the bass lines in your chords. But it’s always worth repeating the value of doing so to keep the momentum moving when you are accompanying yourself on vocals.
This particular riff is what I use for an introduction to the classic “Paper Moon.”
Remember, you can slow down the speed on YouTube to watch the exact chord changes and hand movements. In the bass line, I’m walking the E bass note up to F, then to F# and then over to B.
Again, this is a way to keep the momentum going.