I often hear these mistakes made by German speakers who are learning English.
They say: I made a great experience on my last business trip.
The problem here is with the verb. In English we don’t ‘make’ an experience we ‘have’ an experience.
Correction: I had a great experience on my last business trip.
Alternatively just say: My last business trip was a great experience. (This means that the whole trip / situation was positive for you and you are reflecting back on a positive time.)
Have fun learning English!
Louise