One of the best pieces of advice I ever got: If you want a calmer life, you need to address small problems while they’re still small. The cost of dealing with an issue rarely gets cheaper with time. Procrastination turns uncomfortable things into unavoidable things.
Underrated life advice: Be fully where your feet are. When you're at work, work. When you're with family, be with family. When you're resting, rest. Most people are physically present and mentally everywhere else.