1.kjk has an echo chamber that has given her an inflated idea of herself
How do you know what her "idea of herself" is? Can you read her mind? Why do you care what her "idea of herself" is?
2 she made a mess of the elections and her terrible tactics mean that she is dismissed or ignored or people don’t know her
In what way did she make "a mess of the elections"? She got her party registered only a few months ago, then impressively managed to find 16 candidates to stand when the election was unexpectedly announced. What specifically were "her terrible tactics"?
3 This has given the inaccurate impression to the world that this issue is a fringe issue.
So despite the fact that she lives in an "echo chamber" (point 1) and that "she is dismissed or ignored or people don’t know her" (point 2), she has "given the inaccurate impression to the world that this issue is a fringe issue". How has she managed to do this from her echo chamber? Surely she can't have given any "impression to the whole world" if "she is dismissed or ignored or people don’t know her".
You say that nobody knows who she is, or they dismiss or ignore her, but despite this, the only knowledge most people have of the attacks on women's rights and how genderism is harming children are due to her actions.
Point 3 contradicts points 1 and 2.
4. Others would have made a much better fist of it
Would they? The best comparator might be the Women's Equality Party. Formed in 2015 with lots of publicity, funding and support from prominent people. First contested an election in 2017 with only 7 candidates, only one of whom got more than 1000 votes. In 2019 they only had 3 candidates, none of whom got more than 200 votes. In last week's election, they only had 4 candidates, who each got a similar number of votes to the PoW candidates.
KJK seems to have been very successful in comparison, all the more so since she is ignored by the media. But if you think you could do better, perhaps you should set up your own party ready for the next election. You've got a few years to prepare if you start now. But if "others would have made a much better fist of it" as you say, why didn't they do anything about it? Is it because sniping from the sidelines is easier than actually putting in the hard work that KJK does?
5 this is a terrible shame and a massive lost opportunity
Others could have done something and they didn't. You can't blame this on the people who actually got off their arses and did something.