There is somewhat established, half serious, idea in political science to pick a random citizen instead of a general election, I can't remember the name though.
Over time the two systems would converge, and it's much harder to exert undue influence over the candidates when it really could be anybody.
It's one of those ideas that's worth taking seriously even if it's never implemented anywhere.
I'd like to see a system where parliament is basically like jury duty. Get a random assortment of 300 people, pick them among geographic buckets and give them a support system where employees tell them how the mechanics work (like court clerks / police do for jury duty).
Over time the two systems would converge, and it's much harder to exert undue influence over the candidates when it really could be anybody.
It's one of those ideas that's worth taking seriously even if it's never implemented anywhere.