Instead of news organizations holding general debates, I'd like to see non-political non-profits hold more narrowly focused debates. Can be broadcast by any channel that wants to air it.

Focus on two or three core, interconnected, issues with a few offshoots that are tangently connected.

Invite top thinkers on those specific issues along with the top presidential candidates.

Even if the other invites don't have a shot at being president, it will still force the presidential candidates to try to make valid arguments against or side with people that really know about the issues. The people really should hear these views instead of main candidates just trying to bring their opponent down. And if someone not in the top two expresses something that really resonates with the audience, maybe it gets picked up by a main candidate.