There are also opportunities in crypto games. Some of them like RPlanet and Alien Worlds aren't very "fun" games, but you can buy items that can give you passive income with the games. "Land" is usually the biggest one, where you buy it and either stake it or people mine on it, and you earn.
For crypto games, the land sales can be risky and are usually much cheaper at game launch, but if the game does well, the prices skyrocket so you not only have a passive income but also hold a highly valued asset too. So it is wise to search out new crypto games and sign up for the initial NFT sales, be it land, items, characters, etc...
I don't have enough information about RPlanet, but I can say for sure about Alien Worlds that it's too late to invest in this game, because the prices have already reached their high. The 5 thousand dollars available to the OP will not be enough to buy the land, despite the fact that the price of the plot is now very much reduced there and will obviously continue to decline, because the game is no longer developing.