There are two classes of candidates: Candidates sourced by current employees in the form of referrals, and candidates sourced by recruiters, regardless of how you ended up in their inbox.
Referrals are a class above organically sourced candidates. Usually they skip a few steps in the pipeline, like role matching or credentials verification or reference checks. If the pipeline slows down, a referrer can gently prod the recruiter. In my experience, referrals get to an offer decision in O(days) (Google and other slow monstrosities are the exception here).
By comparison, if you're organically sourced, the only person who cares about you is the recruiter. They're busy, and they usually focus on candidates that are close to netting them commission or hitting their goals. I find that there is an awkward stage in the pipeline just past the initial funnel where most candidates get stuck and drop out for one reason or another.
If you're in this second class, I'd actually recommend working with a headhunter if possible. Not all companies work with them as they take a big chunk of change, but they save you time and work for you.
Better yet, find a job where you know someone who works there who can get your foot in the door and make sure you're treated well.
Now, as far as getting ghosted for scheduled interviews, I've seen this happen too. The most common case is the recruiter is a contractor or third party and isn't scheduling meetings properly. I've had this happen dozens of times. It sucks but not much you can do. Sometimes they don't confirm the interviewers are actually available, and the interviewers never accept the invite. Bad look all around.
The other issue I frequently see is time zone issues. Are you in a different time zone than your interviewers? If so, I'd recommend shifting your clock to accommodate them at least partially. Meeting somewhere in the middle is best.
Lastly, there's a possibility that you're giving off red flags somehow. Is your resume problematic? Did you work somewhere controversial? Are you communicating politely? Would any back channel reference checks reflect poorly on you? I see this a fair bit where a candidate gets burned without knowing why. It sucks. Sometimes there are visa issues at play as well, where employers don't want to sponsor if they don't have to..
In any case, it's usually bureaucracy so try not to take it personally. Recruiters definitely represent their companies, but are often poor representatives. If you can get in touch with someone else, a hiring manager or IC, you'll have a much better time.
Good luck!