Getting rid of a villager quickly and effectively would be cycling them out, if you're at 10 villagers you will probably be getting a mover every 4-5 days. I have a cycling method I use in my main town, if you need any advice on it. All these tips about ignoring villagers, being best friends with them, even attacking them with your net don't work....it's entirely random who moves out and when. Tt'ing is the fastest way to do it