If you want to have kids genetically related to you, freezing sperm is the only option.
If that is not a factor, then adoption is a good option.. Things like transplanting a womb and uterus into a trans woman is still little sci-fi today... who knows in 10 to 20 years from now... then again, the kid will still not be genetically related to you, unless you get a donor egg that is implanted with your sperm (then again you must freeze them before HRT)