I am a 55 year old female who had two hair transplant and my hair continues to be thin

A hair transplant in women are often not a good idea because the donor hair is often miniaturized and these miniaturized hairs, when transplanted, will continue the miniaturization process. A better treatment for women with thinning hair is Scalp MicroPigmentation.

See here: https://scalpmicropigmentation.com/smp-for-women/