If you have Amazon Prime you can go to gaming.amazon.com/home click on Weekly Game, and claim The Force Unleashed 2 and other games right now, free to keep.
Some good free games are Planetside 2, Warframe, Brawlhalla, and Lord of the Rings Online if you like MMORPGs.
If you like driving games and open world, Forza Horizon 5 is on sale for $29.99 on Steam.
If you like city builders, Cities Skylines is well regarded.
If you want a sort of “Minecraft in space” where you can build and fly spaceships and visit entire solar systems each with several huge planets, look at Empyrion Galactic Survival.
When shopping for games I find it useful to search youtube for something like: empyrion gameplay
Watch some gameplay to see if it looks like your sort of game.
Go to isthereanydeal.com and sign up for alerts for game giveaways, they will email you. You can gradually build a BIG library just by claiming freebies.