Why are my ads so expensive?

Good day, I'm curious to understand why my advertisements on various platforms seem to be quite costly. I've noticed that my advertising expenses have been rising steadily, and I'm unsure if it's due to my targeting methods, the bidding strategies I've implemented, or some other factors at play. Could you help me shed some light on the potential reasons behind this, and possibly suggest some strategies to optimize my ad spending while still achieving my marketing goals?