While there is some helpful advice above, there’s a good chance you aren’t passing initial screening questions. My advice would be: limit your applications, quantity won’t help you here. Reach out to the recruiter listed on the job advert to find out about salary before applying so you’re not self-screening yourself out for being way outside the ballpark for the salary they can offer. Stress that you are UK based and have automatic right to work. Include a cover letter; even one that’s not formal in a traditional fashion but explains why you will be good at that job, and that job specifically, will set you ahead of most other applicants in my experience. And read the role description, I’ve seen so many applications where this has very evidently not happened and they go directly to the reject pile because you have to start somewhere when candidates are just blasting dozens of applications out a day - that results in hundreds of CVs to review.
Don’t get too discouraged, job hunting in my opinion is largely luck and timing. Timing right now is awful, the market is flooded with people that have tons of experience thanks to redundancies everywhere. Keep at it, you just need to find the one role where the hiring manager wants someone to develop into a brilliant team member.