As a fellow host, I understand your desire to provide the best experience for your guests, including board games. It's great that you've already invested in a variety of classic games like cards, Uno, Monopoly, chess, checkers, Twister, and Scrabble.
In terms of whether you should buy more sophisticated board games, it depends on your target audience and the type of guests you typically host. If you often have guests who are into board games or enjoy more strategic and complex games, it might be worth considering expanding your collection. You could research popular modern board games that offer a different experience and cater to different interests.
On the other hand, if most of your guests don't seem particularly interested in playing board games or if you receive feedback suggesting they prefer other amenities or activities, it's possible that board games may not be a top priority for them. In that case, you might be overthinking it a bit.