Want to be a happy actor? All work and no play makes an actor a very dull and unhappy person, which is not good for business. Understanding and achieving balance between work and your own life is vital part of your career.
The Old Studio System
The industry puts a lot on an actors' shoulders. In the old "studio" system, movie companies would sign an actor to a contract and groom them for work. The actor would take acting classes during the week, and be marketed and branded by the studio and given work. This system meant a lot less "business work" for actors to deal with, which enabled them to focus on the work of acting.
These days actors need to be their own studios, and figuring out how to be your own CEO can be confusing. It takes a lot of energy to think only of three things: yourself, getting your work seen, and how you can book a job. This thinking encourages you to spend a lot of time focussing on yourself, and less on the world around you.
If someone asked you, “how you are doing?” and you gave them the credits on your resume instead of saying "I am fine, bad, great [or something in the realm of what your life state is]," then this is a clue that you have become too self-absorbed. If you only think about yourself and what work you have booked, what do you have to draw on emotionally for your work? Your life must be broader than your work.
Have An Adventure
Go out into the world and try things you've always wanted to do. Go out and play and do the things you love. Your work will be better for it. You will have more things to talk about. You will have an easier time in an interview. You won't become overly invested in each and every audition because you have a life. Each job booked should be icing on the cake of a more full life. If you don't get a part, you may even be able to feel that it's their loss to not have you and all your wonderful life experience in the character and on set. The more you have to draw from within yourself, the better job will do with your work and the fuller you will be as a person.