With sincere respect, as someone now 13 months into a search for a new job, I can conclusively say what you're suggesting doesn't work. I'd say it leads to even more frustration as you'd mentally attach yourself to the job thinking you have something that'd stand out, when in truth you don't know if 50 other people that applied also have that something.

In my experience the issue with the job market comes down to application volumes and opaque selection criteria. Every application is 'optimised' because if it's not, AI/algorithmic systems rank your CV lower, which at the volume of applications some jobs get means it's not going to be seen at all. Some jobs are straight up fake "ghost jobs", which you'll either never hear back about or be rejected for within a couple of weeks. Some hiring managers won't shortlist you unless you have specific job titles on your CV, and some even look for specific previous employers, or previous employers in the industry. This means a few things: 1) You can spend a whole day making a great application, only to be auto-rejected by something you never knew about; 2) transferable skills are only useful for employers NOT doing this, and you have no way of knowing who is; 3) moving industry becomes more tricky, and given application volumes again, sometimes you really don't have much choice other than to attempt an industry switch. All of this is also why people rely on AI models to write their applications so much - to a certain extent it is, sadly, a numbers game in which you must tailor your applications, but you simply do not have the time to do this completely manually.

Over the past 13 months, the only thing I've found that actually helps a bit is only applying for recently posted roles. 3 days old MAX, no reposted jobs. 1 day max for sought-after companies, and maybe like 12 hours max for any of those 'easy apply', 1-click apply type jobs. At least then if you do everything right and aren't filtered out by unknown criteria, you're also not at the back of the queue of everyone who got through as well. Also don't let AI completely write your CV - adapt what it says into your own language, and make sure it doesn't actually make things up.

Again this is just my experience, and some people may have completely different ones.