If you like reading, you can buy more books to read.

If you like delicious food, you can study recipes and cook better meals for your family.

If you like baking, you can also learn baking.

If you like flowers and plants, you can also raise some plants.

If you like traveling, you can travel with friends.

……

There are many such things, depending on what you like. When you are not at work, you have your own time, freedom and many choices.