If you’re not making enough, and having financial flexibility is important to you, then considering a career change is in order. You might need to go down before you go up. Invest in yourself through education and experience and leverage that to get into a higher paying path (see more on this here: https://ramenretirement.com/2018/04/30/wealth/)
Once you have some real savings and wealth, then it’s all about investing it properly to generate inflation protected passive income (IPPI). I prefer real estate for this (see here for more on RE investing: https://ramenretirement.com/2018/03/18/ultimate-guide-to-rea...). I don’t think enough people consider alternative investments. Putting all your eggs in public markets is a low cash flow proposition, along with lower long term returns (see how returns compare here: https://ramenretirement.com/2018/03/18/ultimate-guide-to-rea...). If you have excess savings, you don’t need all that liquidity and should consider less liquid investments that might have higher returns: https://ramenretirement.com/2018/02/23/youre-too-liquid/
Lastly, people talk about the 4% rule, but that’s bullshit for a whole host of reasons: https://ramenretirement.com/2018/01/21/4-percent-rule/
Save money. Build wealth. Invest it wisely, considering alternatives other than the stock market. That’s the path. Simple, but not necessarily easy.