In your opinion , what is the best way to improve your career fast ,new certificate , higher education , personal relationships with the boss, etc ?

For all this to happen you mentioned in question is required by our presence toimpart experience through the continius work. You must have patience, not frustrated and constantly trying even if you are very tired some times. To get the best relationships with your boss first of all need to be gentle, to be willing and ready to be efficient in every work chance you get. The constant friction with the work makes us most experienced and most accomplished.