Routines are the foundation of time management. I see them as the building blocks that you should use to organise your time.
Step 1: Recognise your behaviours.
These behaviours should be things you do on a daily basis and that you never forget to do. Examples of the things you do and (I hope) you never forget are: brushing your teeth, a meal (breakfast, lunch, dinner), taking a shower, or going to bed.
Step 2: Choose one behaviour as a trigger for a new routine.
The behaviour you never forget to do will be the trigger to start a new routine.
For instance, as you never forget to wash your teeth, then, when you do it, it will automatically remind you to start a new routine, for example, start playing an instrument.
Step 3: Master the new routine.
Do the routine established in step 2 for a week.
Again, as an example, remember you should play the instrument of your choice for a short period of time (for example 5 minutes) every time after you wash your teeth.
Step 4: The routine becomes a behaviour.
Without noticing it, every time you do your triggering behaviour, you automatically remember to do the routine associated with it. Next time you notice, you will be playing your instrument for more than 5 minutes, and you will be playing tunes you never thought you would.
Step 5: The new behaviour becomes a new trigger.
Imagine now that you not only wanted to play an instrument but that you also wanted to learn to paint.
When you have established the routine of brushing your teeth and immediately playing an instrument, then you can use the instrument as a trigger for a new routine in this case painting.
Now you have a chain that helps you build routines. With these routines, you will feel that you are not wasting your time. Your life is your habits, and it is the time that you value and appreciate those habits. It is great to feel uplifted when you do things for yourself and things to nurture your mind.