Sad to say that there is no algorithm on how to start a Monday right. Mondays are just tiring and miserable for all those who know how to to have a fun weekend.
But not all hope is lost, you can be innovative and creative and make your Mondays a little less painful and miserable. For example, I try a different flavour of tea every Monday morning at work. That may not sound like fun especially if you are not a fan of drinking tea. It is fun if you ask me.
Try to do something out of the ordinary at work and before you know it the day will be over.