New Zealand changed away from First Past the Post to Mixed Member Proportional in order to fix that
https://en.wikipedia.org/wiki/Mixed-member_proportional_repr...
https://en.wikipedia.org/wiki/Electoral_system_of_New_Zealan...
I'm not sure how you'd implement it, particularly at the senate level.
New Zealand changed away from First Past the Post to Mixed Member Proportional in order to fix that
https://en.wikipedia.org/wiki/Mixed-member_proportional_repr...
https://en.wikipedia.org/wiki/Electoral_system_of_New_Zealan...
I'm not sure how you'd implement it, particularly at the senate level.