Struggling to find work

I'm in a very similar position to you and am having to stop actively looking for work because it's destroying my mental health. Sadly, the UK job market is the worst it's ever been since 2008. The amount of rejections you're getting is not your fault. The issues are systemic and require government intervention. AI has destroyed the application process, meaning that recruiters are relying on networking to fill roles ad not even look at online applications/CVs/cover letters from strangers. This assumes said job listings are even real and not offshored, fake or already allocated to an internal hire who has to go through the process for "equality" reasons). You'll likely remain unemployed till after the AI/Iran war economic crash, set to occur later this year, sadly.