You shouldn't care about presentation but others will.
I think an llm approach could be good. You make suggestions in however insane language and it converts the format to something boring and mundane accepted by all clients.
Some people are to brief, some elaborate more than necessary.
- Not having just upvote or downvote, but upvote as funny or insightful (slashdot)
- Not allowing to vote or comment until some karma has been reached (new accounts inflame topics and disappear later, having influenced).
- Invite only so one can block while chain of accounts.
- Not allowing to vote or comment every day or every hour, but randomly (more difficult for bots)
- Automatically downvoting posts with grammatical or low-effort errors.
- Having a way to allow replies only from the account you are answering to (so that bots do not switch places while moving the topic).
- Post history public (on reddit it can be made private, so a bot is posting hate in many communities and one cannot cross-check)
- Some sort of graph of statistics of accounts that comment together.
- Paying a small amount as friction for bots (linked to card, etc.)
I guess with AI there would be even more. These are some from the top of my head.