Imagine if you could propose a law, then garner support for it at a grassroots level. E.g back in 2002(?) someone proposes a law that makes it a criminal offens

Imagine if you could propose a law, then garner support for it at a grassroots level. E.g back in 2002(?) someone proposes a law that makes it a criminal offense to declare war without the backing of the UN. Effectively anyone can table a private members bill and then the whole country can vote on it. Most amendments would go nowhere but some would be significant enough to attract enough attention for significant majority of the population to cast a binding number of votes. It would be a more significant moment for democracy than the Magna Carta.