Сheckers and backgammon
Idea: Add a checker piece. Similar to the chess piece: two colors of material + fabric.
One piece will add the ability to play multiple games – checkers and backgammon.
Which in turn have several variations.
Reason: Many people have a chessboard, but I don't think many play chess. Checkers and backgammon are simpler.
For checkers, you can use a chessboard (8x8) or build a new 10x10 one. Instead of turning over a checker, use a checker with a different second color as a queen.
For backgammon, it's also easy to build a board. And for dice, use the curiosity dice. When you throw them on the ground, the result is clearly visible.

