Talk to lots of different kinds of people from every place and all walks of life, and think about what they say.
I like this so much. It doesn't suffer the myopia of a single piece of advice because it implies gathering lots of advice, but it isn't even prescribing advice seeking.
It reminds me of two things. The founders of Stripe would spend their summers as kids interning and exploring different careers (I can't remember where I read this it was so long ago and it looks like it's lost to google). Two, some of the most fearless people I've met changed schools or had geographic moves growing up.
I didn't even consider that the people you talked to would be in service of advice-gathering, although I suppose it would count as that, implicitly. More that for almost everyone I know, including myself, real honest-to-god experience of other human beings in diverse circumstances is the scarcest thing in the modern world, and maybe the biggest point of leverage.
Most of the suffering people experience stems from an inflated sense of self-importance—that the world revolves around them to one degree or another.
The narcissist believes, "I am perfect"; the depressed person believes, "I am useless"; the people-pleaser believes, "I am not good enough." What ties these disparate psychological dysfunctions together is an obsession with the ego.
In terms of actionable advice? I'd say that recognising this tendancy in yourself and others is already quite powerful. Maybe reflect once in a while about what "you" even are.
It's important to know how your mind works and what are its tendencies good and bad. Meditation is the best way to get to that understanding for yourself. Try 15 minutes a day for a month, troubleshooting any problems you have trying to do it and see for yourself if it was worth it.
Ask yourself what do you desire? Don't look at others, concentrate on yourself, educate yourself and decide what YOU want. not the trends, fashions or what friends or family tells you. You decide.
Why? First because I think that human beings have not been loving themselves so passionately as they used to.
Second becose that's the one general piece of advice that applies to everyone.
Third because I'd everyone starts loving himself, the world will again be a place with full of joys. We won't be requiring any type of gun powder let alone the nukes. We will celebrate our every moment. The joys of past will return and refund the old order where everyone loves everyone.