What also helps a lot is blocking like 10-20 top karma users because most of them earn their karma by reposting other's posts. [1] is where you can find an up to date list of those users. [2] is one of the few LPTs about this.

However, I believe Reddit has since changed something so you can't easily block people anymore. So you probably have to use RES.

[1] https://www.karmalb.com [2] https://www.reddit.com/r/undelete/comments/bdvas9/205990561_...