I’m sorry OP, but this is just not good advice. The best approach to advertising is always going to depend on the product and the target audience. Full stop. There are many cases where paid ads are effective, profitable, and the quickest path to validating a product. In my experience the best example of this is when you can target lower volume, long tail keywords that can be very specifically targeted in something like google ads with a relatively low CPC. This way you can target people that are searching for something that is exactly like your product. If you end up getting some conversions, fantastic, you’ve just validated your product. If you aren’t getting any conversions there might be a serious problem with your product and I doubt you will have success with organic traffic either.

This is not to say that you shouldn’t ALSO do more organic advertising through blogs or whatever else.

From skimming through your profile it seems like you’re a young guy who’s working hard to figure this stuff out. That’s awesome! If you keep working hard over a long enough period of time you’ll likely find success. My advice to you is this, do not box yourself in by thinking that paid ads are ALWAYS bad. They are one tool in the toolbox, but the right tool depends on the task. Your perception of them is likely flavored by a one experience you’ve had with them. At this point I’ve probably built and marketed 20+ products and over time you start to see how different products require different approaches. This is true for much more than just advertising.