I think the stable list of instructions that you desire does not exist because your country’s economy is limited by something that is not human capital. Since there are more job seekers than open positions within your country’s economy, the job market is zero sum and any advice will inevitably become less useful as it spread. This zero-sumness makes a stable list of instructions the average person could follow to get a job impossible.
For there to be no stable list of instructions, there must be empirical evidence in favor of a zero sum job market, something that emerges during a labor surplus. I believe the unemployment rate is explanatory because high unemployment is strong evidence for a large amount of unused human capital. An unskilled labor shortage is incompatible with a high unemployment rate since the unemployed would rapidly be hired until full employment is achieved. If instead, a skilled labor shortage was the issue, Finland’s companies (or its government) would use some of their profits to create successful training programs that turn the average unemployed person into skilled workers. This would cause unemployment to fall. To my knowledge, neither of these things is happening in Finland. Therefore, Finland has a labor surplus, rendering the job market zero sum. And with a zero sum job market, the main effect of spreading effective advice about how to get a job is that the effort required to find a job increases.
As for the existence of an unstable set of instructions the average person in Western countries could follow to get a job, I don’t know if such a list exists due to how good advice similar to what XelaP has provided has spread. The amount of effort required to find a job might be beyond what an average person is consistently capable of, especially if one lacks the necessary personal connections. The only advice I have that could be useful to give is this: should you become unemployed, look for organizations that are genuinely hiring and apply there instead of wasting time with organizations that are pretending to hire to signal something to someone.
I think that the skillset required to quickly get hired does not necessarily overlap with the set of skills required to be an effective worker when on the job. Furthermore, I think one’s ability to learn how to find a job may not correlate particularly well with one’s ability to perform while on the job. As a result, I believe that in an environment where the job search is intense, the people who get hired might not be the people who should be hired if your goal was to more effectively allocate labor.
Still, if “getting hired quickly” and “will do a good job” are strongly correlated, then a more competitive hiring process will lead to a more efficient allocation of labor, leading to a stronger economy. I don’t think this would full employment unless the gains created by more efficiently allocating labor are large. If these conditions are empirically met, then we agree that more effective job seeking could in principle lead to full employment.