Best way, try to be as self-reliant, both as an individual and as a group/family/friends. So it helps to have the same mindset. Quality will always beat quantity in this regard. Not to mention will help make you more content. Ignore happiness, it is a short, fleeing feeling that marketers will exploit. Contentment lasts. Seek that. Worth noting my background was in Marketing before I walked away from it.

So, minimize consumerism, keep it reasonable, ethical and try to grow or make most or at least part of your food. The more the better. Learning how to cook well is a good start. Highly limit social media in general.

I stopped watching TV/cable over a decade ago. I am amused and minimally horrified at ads online and on TV these days. Social media is little different. I would rgue it us far more harmful to your psyche. Especially if you spend too much time on it or to younger minds.

Use uBlock on FF derivatives and you will never see ads. That alone is very worth it, specially over time.

Saving up can be done with things that have value, focus on real world assets. Never too early to start.