My solution is far from perfect but it would push people to comment and vote comments just like they write and vote content today.

My idea : Why we don’t have two separated voting power, a big one dedicated to vote on posts (let’s say 80% of the actual one) and a small one dedicated for comments (let’s say 20%) ? That would push users to use their voting power also to vote on comments because if not, this portion of their voting power won’t be used, it would be lost.