Unfortunately, all every aspect of the economy is cyclical, and that includes employment. If the economy can’t support employment, you have to expect unemployment.
In an ideal world, unemployment would stimulate a contraction in the population, growth in other areas, economic migration etc, etc etc. Sadly, our benefits system stifles all these natural effects causing economic stagnation.
Ecomomics is just like Darwen, but with money rather than genes… innit.