Depends in the game, you will need to find out weather of not that game is kind of game people play in 2022. If it is played there are couple of ways i can give you at the top of my head - 1. Make a game GIG on fiver and sell your game 2. Grow you Instagram account and make it all about the game. 3. Find entrepreneurs who make IT products and pitch them. 4. Find a startup which makes games and sell them, use angle list and LinkedIn to find them.