I completely agree that perhaps the firm's you had been applying to maybe weren't the right fit for you but also it's important to bear in mind how much of a luck game this whole thing is. I feel like surely they can't rule you out, if anything it shows how committed you are to them ahaha.I have been applying for quite a lot of cycles now. I am starting to worry whether some firms would completely rule me out now after several years of applying to them, even though I have changed up my application and gained new experiences over the years. I have also noticed that my successful applications this year have been with firms I have never applied to before. In a more positive view, maybe this means that I am getting closer to finding the "right" firm for me ...
Glad to hear you switched up your approach and are seeing some success now! I also did similar and have seen more success this cycle.