A lot of people answering this struggle to understand what highly-specific means. I'm looking to, for the sake of experiment, highly-specific advice that gives a reader clear understanding of what they should do. Unlike the vague advice, on the contrary, that may be too abstract to get implementing it right away.
Inspired by this post but I wanted to change the question a bit to avoid the really vague answers as well as lower the age bar of target audience for the advice.
I'll start with a bunch myself, to give a better example of what I'm talking about:
- Read The Art of War by Sun Tzu. Ironically, because this is a post about specific advice, dude wrote a book with vague rules on how to do war, but the way it is worded is ridiculously good. If you take your time to think about the advice, you can find their appliances in the most unexpected fields.
I, for example, have improved my skill in videogames, out of all places, after reading the book. Sun Tzu said "If it is not advantageous, do not move". Instead of rushing into combat, I now consider whether my position, current health, location of health packs etc. work to my advantage. Sun Tzu made me realise team-based PvP shooters give you room to avoid and disengage combat, you can make more impact for the team if you choose your battle and have everything work for your advantage.
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Exercises are not just about a lot of dedication, long commutes to the gym, expensive memberships and the fear of being judged by other gym members. 7 minute workout is a thing and it will give you all the benefits at your own home without the need for equipment, and it won't take much time either.
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Buy an old used Kindle. For dirt cheap, you will get a device with a good e-ink screen that works without Internet connection, still has decent battery, is light and small. A new thing that makes reading so comfortable will trick you into reading more and books still happen a good medium for sharing information.
Get a habit of tracking your habits. When you know everything you do while "on autopilot" and why, - you can outsource a lot of chores and work to your "autopilot" self by setting up your routines and habits correctly.
This skill is best learned as soon as possible, and it's a shame it's not taught in schools. 20s is a good time - all the momentum you gain within next 20 years can carry you the rest of the way.
Also, don't be hard on yourself for failing. You'll see tons of good advice - a lot of it will seem essential (like being financially responsible), for good reasons. Just know that failing at all these things does not necessarily make you a failure or a bad person. Who knows what struggles you might/will face - as long as you survive and take care of your loved ones, you should be ok. Ultimately that is all we can do.
Also, try to engage with physical things more: people IRL next to you, touch grass, craft something with your hands. Of it's not physical, it exists in your head, - and your head might not always be the best place to spend most your time.