Live life to the fullest and enjoy every moment. Easier said than done. A few simple practices can improve your ability to enjoy life. Practice each one until it becomes a habit, then move to the next. In no time, you will be filled with enjoyment.
Complaining is a waste of time. It allows undesirable thoughts to take over and makes the complainer look negative. Not only does the complainer waste energy, so do the people listening to the complainer. Limit negativity to increase positivity. As soon as a complaint registers, down play it. The complaint is a concern, but in the grand scheme of things, it is no big deal. Not even worth the time and energy to say aloud. Instead, think of a positive aspect of the scenario or change your train of thought. Do not get lost in pondering, there are too many wonderful things to think and speak about.