Human beings discovered a peculiar concept called 'Boredom'! If you don't have anything to do you are bored; if you have to do the same thing for repetitively then you get bored!
If repetitive activity leads to boredom you should get bored of brushing your teeth or drinking tea and many we are doing repetitively. In this universe everything is happening in a cycle- sun goes and comes back, planets orbit the sun cyclically, we ate breakfast yesterday and today as well!
The creator's plan is repetition and nothing is linear including reincarnation whether you believe it or not. Nothing waits for your belief to exist or validated; gravity exists irrespective of your belief. Don't try jumping from high floors to disprove gravity!
Lack of activity or repetitive activity does not lead to boredom but the attitude with which you undertake a work or mission makes you bored. Mahatma or Isaac Newton or Sankara was never bored as they were so engrossed in their purpose and they saw divine in every act.
When you have no purpose or goal in any act of life whether it is professional career or in personal you are bound to be bored. Remember the two stone cutters one cutting stone for 'Stomach' and other for building a cathedral. The act remaining the same the attitude makes the difference.
Please never go through the motion in life; find a purpose first then you will never get bored.