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Your β in 'saber' is closer, but it still needs to be a bit stronger. Touch lips first, then slightly part them. Don't let your lip fall into your mouth.
In addition to the video I linked to, there are other videos online where native speakers try to teach the sound of the intervocalic 'b' or 'v'. Watch their lips and listen to how close the sound is to a hard 'b' or 'v'.
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