Be kind to yourself
Sometimes a lack of motivation really means you need a rest. If you've been working too hard, have a real illness, or have been dealing with emotional distress, it’s perfectly normal to lose motivation and energy. Sometimes the very best thing you can do is give yourself a mental health day — without guilt or shame. This should be a conscious choice based on self-awareness — not a belly-up response to feeling bad about yourself.
Motivation, like so many other feelings, is fleeting and mercurial. Sometimes you can manufacture it, but often it comes and goes of its own accord. Rather than rely on motivation to determine your behavior, decide how you want to behave and invite motivation to catch up. With or without it, you are capable of accomplishing great things.