I would say it's more of earning money than keeping it, you can't possibly save money for long when you don't have a stable source of income.
It is not about that, it is about the amount of discretionary income. You can definitely save money even if you don't have a fully consistent source of income as long as your discretionary income during times of employment is sufficient enough. But if you are more unemployed then employed this will probably not work, so the details are really important to know the truth about these things.
So with a constant income, one could achieve financial success.
Many people with constant income are barely able to save anything, and even fewer are able to achieve any kind of financial success so it is not about constant income. This also proves that it is primarily about discretionary income and not about income stability.
Financial management is important but can never be overemphasized when the source of income is shaky, that is the basis of a balanced life.
All sources of income are shaky, some are just less shaky than others.
Financial success is far beyond just earning money and saving it, as a matter of fact if you look at the reason behind why bitcoin was created, you will discover that there is a serious global challenge to financial system and people have been keeping silent to this serious issue until we have bitcoin being introduced, when you earn money, try to invest, after you have invested, also try to diversify and be in control of your assets altogether.
This is true but I would say that not that many people are still interested in these things. Look at the different communities around crypto and you will find that very few people are trying to live the life of challenging the financial system. This is even more prominent in shitcoins where probably 99 percent of the users do not care about decentralization or financial freedom, they just care about fiat profit. I mean some of them can talk a big game, but if they are not living their life in accordance to the beliefs that they claim that they have then their beliefs are not real.