Here's how to make a bad game worse for everyone:
With a second monopoly completed, your next task is to improve those properties to three houses each, then all of your properties to four houses each. Six properties with three houses will give you more than half of the houses in the game, and four houses each will give you 75% of the total supply. This will make it nearly impossible for your opponents to improve their own property in a meaningful way. Keep the rulebook nearby once the supply gets low, as you will undoubtedly be questioned on it. At this point, you will be asked repeatedly to build some friggin' hotels already so that other people can build houses. Don't.
At this point, you more or less have the game sewn up. If losing a normal game of monopoly is frustrating, losing to this strategy is excruciating, as a losing opponent essentially has no path to victory, even with lucky rolls. Your goal is to play conservatively, lock up more resources, and let the other players lose by attrition. If you want to see these people again, I recommend not gloating, but simply state that you're playing to win, and that it wasn't your idea to play Monopoly in the first place.
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