Elimination of downvoting can help, but another contributing factor that can help create community is to only give voting rights to those that have a specific amount of karma in a community.

This is a good idea, voat had an idea like this. The end result though is you get groups of people farming karma just so they can upvote. You get whole subs of brigades of people posting garbage just to upvote each other, which is what happened on voat.

I had the idea that maybe there could be levels? And people who are ranked higher have their votes give more points? And you can only ascend to a higher level by getting upvotes from people ranked higher than you? What do you think of that idea