There's Fallon Fox in MMA who only has a single loss on her professional record and broke an opponents skull.
There's Mary Gregory who broke a powerlifting world record in her masters category.
There's Laurel Hubbard in weightlifting.
There's more but I CBA to list them all out when a simple google search reveals what you're asking for quickly.
Ok so I asked for you to name trans woman people dominating in their sport so let's look at the people you listed.
Fallon Fox MMA record 5 wins and 1 lose.
If you actually look at the women she beat every one of them have a terrible lose record against other women the one time she faced anyone good she lost. That is hardly dominanting her chosen sport. Had she a record of 30 wins and 0 losses then you would have an argument but not with a 5-1 record. And yes in her fight against Tamikka Brents, Brents did suffer a concussion, and an orbital bone fracture, but that type of injury is not uncommon in MMA and has nothing to do with Fallon being a trans woman.
Also just want to post this about Fallon and other trans women in combat sports.
Eric Vilain, the director of the Institute For Society And Genetics at UCLA, worked with the Association of Boxing Commissions when they wrote their policy on transgender athletes. He stated in Time magazine that "Male to female transsexuals have significantly less muscle strength and bone density, and higher fat mass, than males" and said that, to be licensed, transgender female fighters must undergo complete "surgical anatomical changes ..., including external genitalia and gonadectomy and subsequently a minimum of two years of hormone replacement therapy, administered by a board certified specialist. In general concurrence with peer-reviewed scientific literature, he states this to be "the current understanding of the minimum amount of time necessary to obviate male hormone gender related advantages in sports competition". Vilain reviewed Fox's medical records and said she has "clearly fulfilled all conditions.
He clearly states that trans women have zero advantage over cis women in combat sports.
Mary Gregory does not count as her world records have rightly been striped from her as she has not yet fully transitioned and should never have been allowed to compete in the first place as she never even made the requirement of being on Hrt for a minimum of two years required by all trans athletes to complete in sports.
Laurel Hubbard has won a few minor weight lifting competitions but has not one anything major so again she is not dominating her chosen sport.