A question many people care about is: how to sustain yourself long-term in this circle.

Actually, for beginners, the most important point is to protect your principal first.
As long as your principal is intact, you still have the capital and confidence to stand firm in this circle and even in society.
Don't throw all your principal in just because you're excited for a moment; gains come quickly, and so do losses.
Temporary profits don't mean you'll be able to maintain them forever. We are just ordinary people, not the "gods" of the upper class.
Timely stop-loss is very important. It's better to lose a small part than to stubbornly hold on and over-leverage yourself, ending up with a mess.
The only one who ends up cleaning up the mess is yourself.
Others only care about the money in your pocket, not about you as a person.
Steady progress is the long-term strategy.