A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Investment is a side income, it's almost impossible to make it a main income cause so much of it is out of your control. Some low risk ETFs and bonds are the way to build your portfolio.
The best way to get wealthier is to get a higher paying job, if you can't comfortably live and still save at least $500 a month you need to increase your income before investing will become viable.
While I agree with most of what you said, solely focusing on a high paying job is a guaranteed way to create an unhappy life.
Building financial discipline and learning how to save is one of the most critically underrated skills in creating personal wealth. You wouldn't believe the amount of high income individuals that struggle to live BELOW their means and can't build their net worth.
At some point, it's more about how much your save, than how much you make.