We reflect what we surround ourselves with.
Boredom doesn't make people creative, but it can make people go out and surround themselves with something that inspires them. Kids need to be bored, otherwise they will not have the space to create. Boredom is space, a blank canvas. Fill it with inspiration and the creativity can breathe.
Maybe it is because of my aphantasia. I cannot visualize anything, so the inspiration has to come from something external that I can see.
Possibly. I need far more external stimulus now, but it isn't anything that I need. Sitting in front of a screen does not inspire me to act, even if my head says "that might be fun". Being bored however means I will look for something that might be fun, rather than turn on the TV looking for a way to escape the feeling of boredom. Boredom is a gift, but we needn't be bored for very long if we are willing to act.
And yes, it will work with financial things too. Rich people tend to surround themselves with financial content in various forms, and discuss and think about it often. It is an interest of theirs. If you got interested in tennis, bought the equipment, got a coach, played regularly and practices, you would improve. You stop playing, stop surrounding yourself with tennis, you will degrade.
This is just human nature.
Out of sight, out of mind. '
If you want to have something particular in your life, surround yourself with the content that keeps it in your awareness, and perform the actions that lead toward having it.