Following a really positive book doctor report on my MS that said in a fair world my book would get published, I started submitting back in May. I’ve had nothing but form rejections.
So my advice PB is, when the rejections start coming in, you have to hold on very tight to the fact that it’s not your writing that’s bad, it’s just very difficult to get an agent. Right person, right time.
Good luck with the submissions. This has given me a kick start to go and send out some more.