I feel like I remember reading about a hypothesised digital voting system where every voter can either vote for themselves, or pass their vote to a representative, that can in turn pass their own and any collected votes to another representative. But each voter can withdraw their vote from a representative at any time.

So you could still have a representative body, which I think is important for getting work done. But citizens are far more empowered; if you disagree with your elected representative over a particular issue, you can rescind your vote from them temporarily and vote directly on the issue yourself.