Just think about your routine. Now think about your routine which does nothing to motivate you. AND NOW think about what you can do to change it. Let us become detectives for a day and see what drains us and what might made a huge difference to how we start our day.
So, how can we do this. We start by breaking the normal pattern. Wake up 30 minutes earlier and have either a power hour (or power half hour), or do simple floor exercises or yoga, or sit down and plan out your day exactly as you would like it to be. Follow the rule of TAB Think Act Be. If there is something in your daily routine that drains you - change it. Clear your desk, or rearrange it. Get rid of the stuff which just clutters your space. Eat a different breakfast, different lunch - go for a walk, or leave work on time.
Do not accept anything negative for a day. When people ask "how are you", just answer "terrific!", and see how you feel just saying that word. Don't let negative people drain your energy - if they want to be miserable, that is their choice. You stick to making your day different, fun, interesting and exciting. Think of 3 things you can do that will make tomorrow even better. And before you go to sleep remind yourself. "well done for having such a great day" and think of 10 things you are grateful for in you life and then drift off to sleep with a smile on your face.