Good day i need to change my contraceptives, which is the best to use , for a female at the age of 29?

Don't have a clue: The "best" for anyone is whatever is determined after a good medical history, review of present health issues & meds and an understanding of how/why it is being used. An IUD requires little daily thought but is pricy. There are dozens of "pill" choices that may or may not work well with a particular person. In short, you find this out by working with a health professional over several months.