Dr Frederik Mulder has presented a paper outlining some of his personal experiences in the Anglican Church alongside outlining some of the wider issues regarding orthodoxy within the Church of England. I think his points are reasoned, well-made and bear serious consideration.
The video is an hour long but can be watched at 2x speed and is perfectly understandable that way. But I would encourage you to watch it and take his argument seriously. He is really outlining the process he went through in addressing questions of orthodoxy and heterodoxy within the Church of England and why the arguments made for remaining within simply do not add up and stretch credulity to breaking point.