I have a simple seven-point plan that will absolutely reverse the trend and revive the Church of England:
Publicly repent accommodation with the world.
Announce the Counter-Accommodation, a house-cleaning movement that throws out every reform and innovation since 1950 and openly rejects the false idea that tolerance and inclusion are Christian virtues or that unrepentant sinners are welcome as members of the Church body.
Excommunicate every bishop and former bishop who voted for the ordination of women.
Excommunicate every bishop and former bishop who voted for the ordination of homosexuals or officiated over a same-sex ceremony.
Defrock every female and homosexual bishop or priest.
Suspend every bishop or priest who publicly endorses social justice, tolerance, inclusivity, or ecumenicism.
Preach the Word of God precisely as it is communicated through the King James Bible.
If the Church of England will not do this, it has no reason to exist and fully merits its extinction. Observe that the long term results have been exactly what the conservatives who opposed these reforms have been predicting all along. When a Christian church rejects the Word of God and hares after worldly approval, it is not long for this world.

And the UK's atheists probably won't be too pleased with the Church of England's demise. I tend to doubt they will find their new Muslim neighbors quite as easy to push around as lukewarm Anglicans.