Balancing Life Requires a Plan
You cannot change how much time there is, only how you use it. Each week you have 168 hours, no more, no less. Prioritize the activities you can do then schedule them every week. Literally make and use a weekly chart with half hour divisions. We'd all love to think we can just go with the flow but the reality is that planned time is efficient time.
First, you need to take care of your health so figure out how much time is healthy for you to sleep, you need to eat (and cook) and get exercise. This isn't time you should ever makes cuts in because if your health goes, everything else will go too. You may need to consult with your doctor about what is best for you since every person is different. I discovered that if I work out 30 minutes a day, 5 days a week it solved all my blood pressure fluctuations and subtle changes to our diet made us healthier without adding extra time to preparation.
Many of life's necessities require money. Schedule how much time you work each day including both work hours and commute times. Try to get your job on board with this idea of a firm schedule if you can. Having regular hours greatly increases your ability to balance things. If you have a job which is not this regular you will need to call upon your family to help you remain flexible but keeping everyone in the loop when things change. This means regular updates about work hours and projects and never being foolish enough to "promise" to do anything when there is even a chance of things changing.
Next determine how much time you need to spend to keep your household functioning in a healthy fashion by scheduling housework, shopping, outdoors work, and financial management. See if you can spread these tasks out over the course of the week and get other family members to help. Never pick up someone else's chores because that interferes with your own schedule as well as sending a message that their contribution is not needed. Be realistic about what each person can do. I have allergies so chores that put me into contact with my allergies are out of the question. I have the most experience cooking and the most food intolerances so those chores are mine.
Fourth, figure out how much time you need to spend to keep your relationships healthy. Don't assume they want to spend the same amount of time you do or even that time much be spent one-on-one or doing a particular activity. You will need to determine how each of you feels and displays affection. For my family it is primarily a matter of words and physical affection but for me it's a matter of time spent together. Once we figured out these differences we can each push ourselves a bit more to give the other what they need but also to recognize these displays of caring. I schedule one hour each evening to spend with each member of my family usually doing something like play video games or watch a television show. As a family we eat dinner together and watch the news. Each day I make sure to verbally and physically connect with each family member as well which takes only minutes of time.
Now determine how much time you need for yourself each day. This will require some experimentation on your part as well as flexibility. Doing the same thing everyday for yourself can get boring and lessen how it refreshes you. I try to vary things between reading, movies/television, video games, listening to music and dancing, as well as some crafts.
Plan other fun times on a weekly basis. Set up a game night or a movie night and make it a regular event. It doesn't have to be a big production. We have a once a week friends time set up each Sunday in our household where folks just come over for a few hours and hang out. We volunteer our house, everyone brings food, and we all have fun as well as catch up. Do not feel you must be the family that volunteers your house; be open to going else where once a week.
Finally look at the hours you have filled in. If there is anything left, feel good about it and add in some more time for yourself or for others. Better, keep those free hours or half hours free in case life tosses roadblocks in your way. If you ran out of hours reorganize your priorities.
Balancing life in 168 hours a week requires everyone in the family to get involved. The best way to do this is for every member to have a schedule and then combine them on a master calendar or chart. Each member then should also keep a copy for their own reference. This keeps everyone on the same page and helps your family run more smoothly.