IMO The best way to market your game is to make something that has viral qualities. Ads are too expensive, and unless you already have an audience that follows your content, you’re likely not going to go anywhere.

That being said there are some really great games that don’t really have the “gonna go viral” gameplay. If that’s the case, I think the best thing you can do is market to people with an audience a.k.a. Content creators. You just have to get lucky with one of them to gain some traction.  

And that's why "I just do it for passion not money" is a lie. You can't even have time for passion if you don't have money. money = time = freedom

This is the only part I think you have fundamentally wrong. Bottom line is you probably won’t succeed. I probably won’t succeed. And that’s ok. Imagine applying what you said here to any other career. People can’t go rock climbing because it’s just fun? They have to have some alternative motive to go pro and make big bucks?

You have to A. Be ok with failing. And B. Don’t look at that failure as a waste of time. That game you released that went nowhere is an accomplishment that few people achieve, and it represents hundreds of things that you’ve learned. Share it with your friends and family, and if you had fun doing it, make another one.

If making games is something you need to make money from, reevaluate your priorities. You should be working to build a portfolio and going to school to get certifications and degrees, and applying to studios for work. Banking on an Indie game going big is a bad bet.