Make it so that new accounts have to wait 24 hours before posting on entries where the most recent comment was 30 days or older, and redirect new accounts to the entry on necroposting
This will reduce the amount of irrelevant topics being forced onto the trending bar, and also reduce the population of Lobotomites who create an account and force topics onto trending because their """""hot""""" "take" is just that important
(this idea brought to you by the Oceania Inner Party)