[pabe]

Substantial passive income requires a bigger financial invest, e.g. if you can buy 1,000,000 ADA and stake those, you'll get round about 50,000 ADA rewards per year (39,000 USD, currently). Same with stocks, buying an apartment/ house to rent it to others etc.

So, you'll have to maximize income and reduce cost as much as possible to fill that "investment bag". One way to do that is to become self-employed, win a corporate customer that is okay with remote work and move to a lower-income / cost country for 10 years.

A lot of people today try to build traction for their digital product in a large enough niche. Never ever underestimate the effort needed for that! That hasn't much to do with passive income.

If you've got a talent for writing, you could write 9.99€ Kindle books for high margins.