if you have an original idea how do you change the economic and monetary sistem?

If I do, then what?

You get political and stay political. You don't need to be an elected representative to make your contribution, but you do have to talk to them. If you have resources, favor supply chain paths that agree with your philosophy. Just be ready to exert small amounts of force over a long time rather than trigger a revolution. Successful revolutions are not very common. If it is a good idea for everyone, it will grow wheels of its own. if it fits into a book, write it. Karl Marx did it and the darned thing sold even though communism won't work.

since spelling "system" is outside your range of things u are capable of doing- i wouldnt worry too much about changing "the economic and monetary" SYSTEM [which raises so many questions btw, whose system? which country? are you actually helping? what is the scope of your idea?--is it realistic? and so much more...]