The idea I stand by is only people with unenchanted armor can attack people. It retains all the aspects of PVP that people enjoy, while balancing it in a way that people who don't like PVP can compete with, since they would have enchantments on their armor. There would still be the risk, bandits would still be possible, but the bandits wouldn't be able to steamroll people with end-game gear. They would actually have risk to themselves. Another idea is a placeable block that keeps people from getting combat tagged within a certain area, while disabling damage from other players before combat tagging. People cannot place blocks in combat if I remember correctly, and this would give people both safe spaces as well as something they couldn't exploit.