What can I do differently to find employment?

I've been actively looking for a job for the last 18 months, and having no luck. I've applied for many roles, both directly and, occasionally, through recruiters. All of these roles were very close to my existing skillset (webapps with Java, React or Angular, microservices, k8s, distributed messaging, ETL, etc), but recieved no response.

I've signed up for various job boards (indeed, ziprecruiter, jobboutique, jobhire.ai, etc) and I only get misleading "X is interested in you!" spam email from them. I'm not sure where or how they get their data, but it seems very low quality. I've taken to only applying directly or, on occasion, through LinkedIn.

Not that long ago I would have 10 recruiters with offers in a week of showing availability on LinkedIn. Now this. I'm not averse to working harder to find a role, but now I can't even get an interview for a heads-down corporate job, let alone anything more interesting.

Any help or advice appreciated.