Sorry that things are getting really difficult OP 
Agree that reversing regulatory capture is the key to reclaiming women’s spaces and opportunities and to safeguarding women and children.
To speed that reversal of capture and to make solid new gains for women and children, we will also need Parliament to act.
This is around GRA reform but also to bring in new legal protections for children and young people. It seems that medical culture and current regulation isn’t sufficient to protect them at present as detransitioned people and whistleblowing staff have said.
So Parliament needs to have various select committee enquiries: on children and GIDS/insufficiency of CAMHS provision, on appropriate care and support for detransitioned people, on women’s sports, on prisons, on single sex public and workplace toilet provision, and many more issues.
These can gather evidence from as wide a range of views as possible, then with well-informed MPs, government can be encouraged to take up the committees’ report recommendations. Then we need well-informed drafting and debate in the Commons and the Lords towards statutory amendments or making new statute.
Court cases are key of course and can be used to force governments to draft new laws in reaction, especially if they get to European level, but that progress through the courts can take years.
My worry is that the pandemic and economic recovery and Brexit will understandably take up a lot of Parliamentary time (next ten years?) so none of this will get much time and the status quo will be normalised.
So we need to keep on writing to our MPs and ministers even if (like my MP) they don’t write back.
It’s not ideal if the GRA remains in force but with reforms outin the long grass for the very long term.
There are already creeping areas of GRA scope being argued to be ‘grey areas’ (like whether parents with GRCs should be able to use their own GRC-assigned legal sex status on their kids’ birth certificates, as in the case brought by Freddy McConnell who made the ‘Seahorse’ film about their pregnancy)
Also as Keira Bell has pointed out, there are basic problems with GRA that make it unworkable: there’s no legal revocation of a GRA once granted, unless through ‘fraud’ or in the case of fluctuating identity.
So the holding of a GRA then denies the possibility of detransitioned people regaining their birth legal sex, unless they say things which aren’t true for them in order to comply with GRA requirements. This is totally unacceptable and hopefully will be subject to legal challenge by someone at some point.
Another part of the reason for trying to keep Parliamentary interest towards reforms current, is that there is a majority government in place. This makes change of this kind much easier to achieve if the will is there, although to sustain any such change long term there must be cross party support.