If you miss the games from the arcades of the 80s, or the classic Mac, Apple II or other systems, you can still play a lot of them on your Mac today. They are free and you don't even need to install anything.
Learn how to use the Finder's four views: Icon, List, Column and Gallery. Each view has its advantages in different situtations.
If you don't like the colors or brightness of the macOS Big Sur default desktop wallpaper, you can create your own. It is easy to take the default image and tint it to your own color or even add more to the design.
The MacBook Pro Touch Bar can be a useful productivity tool if you take the time to train yourself to use it. The first steps are to learn what it is capable of and how to customize it.
Hover Text is an Accessibility feature of Catalina and Big Sur that allows you to see the text your cursor is hovering over in a larger size. You can also see the text you are typing into fields or even apps like Pages. It is great for those that occasionally find text in an app to be too small to read.