Similar to systems thinking, just the ability to play out scenarios in your head given a set of rules is a very useful skill, one which programmers tend to either be good at because of genetics or because we do it every day (i.e. simulate code in our head). You can tell when someone lacks this ability when discussing something like evolutionary psychology. Someone with a systems thinking mindset and an ability to simulate evolution tend to understand it as obvious how evolutionary pressures tend to, and really must, create certain behavior patterns (on average), while people without this skill tend to think humans are a blank slate because it's easier to think about, and also is congruent with modern sensibilities.
This skill applies in everyday life, especially when you need to understand economics (even basic things like supply and demand seems elusive to many), politics etc.
You can even benefit from the thinking taught in good high school coursework (or studying online).
At an arithmetic, bookkeeping level you can better appreciate handling finances and the seductive pitfalls surrounding wagers (gambling, betting, risk taking).
* How many have a lower return on { X } through not understanding compound interest, tax brackets, leveraging assets, etc.
* How many have steady net losses through "magical thinking" wrt gambling, betting, hot stock tips.
They don't though - there are benefits all the way up.
Giving a few examples of benefits from low order mathematical thinking (understanding concepts of compounding, etc) does not equal a statement that these are the only benefits.
Some of us are satisfied with, say, dimensional reductions of spectral geophysical surveys to improve imaging and train that against existing production records to highlight potential mineral leases.
Others might like to leverage symbolic algebra systems to crack quantum encryption candidates.
A good number like to get rich via high frequency trading, some like to sail satellutes against the magnetic currents of the planet, there's a world of optimisations in logistics that have been implemented and are still being fine tuned to improve throughput efficiency and fuel consumption.
But you're not really asking in good faith here, are you?
that being said, my marketing pitch for math was always, nothing else is even close to as intellectually stimulating as math.
As anti-intellectual as it sounds, you could imagine someone asking, is it worth devoting years of your life to study this subject which becomes increasingly esoteric and not obviously of specific benefit the further you go, at least prima facie? Many people wind up advocating for mathematics via aesthetics, saying: well it’s very beautiful out there in the weeds, you just have to spend dozens of years studying to see the view. That marketing pitch has never been the most persuasive for me.