Do you mean 40 apps this year? Or 40 apps total since 2017?
If it's 40 apps total, it seems you should expand your circle, as it looks like you're applying only to magic circle and US firms, whereas perhaps it would be better to qualify somewhere slightly less prestigious and you can always move post-Q.
I have made 100+ apps this year, I don't yet have a TC, but I can see that my employability is better at less prestigious firms, and perhaps whatever is causing you to fall at the final hurdle for these global elite firms would be non-fatal at lower ranking firms.