Unfortunately in recent years, the number of great games for Mac has declined because many are no longer supported. Every new version of macOS tends to break a few games, but macOS Catalina in 2019 meant that lot of games that used 32-bit code were no longer Mac compatible.
At the same time that Apple went 64-bit only it also introduced Metal for 3D graphics, which left a lot of games developers with a decision: make new Mac versions of their games or stop making them. Unfortunately many chose the latter.
This has started to change with the arrival of macOS Sonoma is here. With Sonoma, Apple provides two things: a new Game Porting Toolkit to make it easier for game developers to bring their games to the Mac, and a new Game Mode to ensure a game gets the highest priority on GPU and CPU, for better playability. Read: How to use Game Mode to boost performance.
Read more at Macworld.com