It probably depends on the stakes of the game and the poker player play-style. As said already, there is no single "winning" strategy or play-style. Many styles can be effective and it is up to you to discover which winning style best suits you. It is also worth noting that the best players all adapt their "style" to the situations. Even if a winning TAG style playing 10% of hands works for you, it is limiting if you don't adjust to the situations.
(for an extreme example: you are at a table FULL of NIT players who literally only wait for AA. Well now your 10% of hands is actually missing out on the situation. You can widen your range a lot to exploit the table and if anyone plays back at you, then you can confidently fold right there and know for sure they have exactly AA
All right, this is a dramatic example as even NIT-players usually play wider than only AA, but it illustrates the point that it is beneficial to adjust strategies sometimes)
The simplified question asked here seems to be: "What do consistently winning poker players share in common?"
To this I'd answer several things such as:
- A lot of determination to not only continue playing through variance, but also an important determination to keep learning and improving their
poker game.
-
bankroll management. Doesn't matter how good you are at poker, you WILL go broke with bad bankroll management (or lack thereof). Having a disciplined bankroll won't 100% eliminate the chance of you going broke, but it will make it a lot less likely and this is a must for any long-term player.
- Table selection. This is connected to bankroll management. Table selection isn't always possible (like an MTT where you don't decide where you sit), but even there is sort of is because you decided what stakes/buy-in to play. Do you want to play softer tables and grind it out for the money or do you want to seek the tough tables and improve your poker game (while almost certainly losing money there for a while)? It depends on what your poker goals are, but table selection is very important.