I was asked this question by many and at various stages of my life. This was the toughest question for me.
Every time I used to think who? and used to answer some random name. I knew this certainly doesn’t seem right.
Then, one day, I realized I don’t have an ideal; rather, I look after myself every day. I have my own imaginary self who is full of all those qualities which I want and with all those values which I want to hold.
Every day when I wake up, I decide at least one improvement to be executed along with all I am already mastered during the day.
When I go to sleep, I review did I make any difference? If yes, sleep, else do something new before going to bed.
New things refresh your mind. The same thing daily and no improvement makes your mind lazy.
So, make your best imaginary version as your ideal, compare your today with your yesterday, make at least one improvement daily, and feel motivated for the whole life.