This might be a bit hard to do but how about like a player warning tag? Maybe if said player has been banned/kicked for toxicity and harassment, they get an icon/tag next to their name. This would make it easier for staff members as they could be suspicious about a toxic player even before the player starts harassing again, keeping a close eye on them and being able to instantly deal with the situation (if one occurs) and minimize the damage they could cause. Maybe after a week the tag could reset or something, idrk, would love to hear everyone's thoughts on this :))
Also just realized that it will help staff out a lot more when it comes to players who constantly change their name.