We onyl have so much time each day, so you should try as much as possible to spend it doing things that you like. Ideally you should spend it doing things that both improve your skills or you as a person and doing something that you like. For most people, this seems to give a greater sense of satisfaction than just sitting in front of the TV.
Trying lots of new things is a great idea and will help you find what you really like. The ones that you stay with and get good at will give you the most benefit.
However, there are also times when we should give things up.
For example, let’s say that you decide to try and learn the piano. You purchase a book, take some lessons, and learn to play a little. However, after time goes by, you find yourself playing less and less. It’s not that you don’t like to play, but it isn’t important enough or enjoyable enough to make a priority. Unfortunately, the entire time it will be on the back of your mind that you should be playing more. As long as you keep it in your mind that you will “practice tomorrow”, that guilt will keep nagging at you. Deciding to just quit can help relieve some of that stress.
So when should you not quit?
When you enjoy it too much. You don’t care how good you get, but you sit down and play everyday anyways. Doing something because you love it is always better than doing something because you think you have to.