Good morning, Maxi.
(1) Congratulations, your grammar is perfect. (You do need a comma after "office.")
(2) But I think that you have chosen the "wrong" words.
(3) For example, I am just an ordinary person. I can go to any
government office building and sit down. But I cannot make any
decisions. Only government leaders can do that.
(4) I believe that you probably want to say something like:
If I had the authority, I would lower the prices for public transportation.
Have a nice day!
Student or Learner