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.
The game is still developing - they are about to release the awaited "Thunderdome" events. It does progress slowly though because they are a small development team.
I missed the part about the $5k limit or maybe it was added, but probably it was late and I was reading while asleep lol, but you can easily use a very small portion of that to buy tools to mine with, and the game is not time-intensive, so it's partially passive. You only click 2 buttons every time the cooldown is reset. It creates an income, even if small at this time, that could be worth much more in the future, because even though TLM hit a high during the binance bridge announcement, it could easily go higher than that in the future.
But yes, most lands are more than $5k now, even though I have seen some go on sale for close to that recently.
As for RPlanet, you can buy a ton of stuff for $5k on AtomicHub and stake it all and earn very passively. Then you can watch the conversion rate on Alcor exchange and trade Aether for WAX and sell that on bigger exchanges.