The best way to stack more of course is to make more money. But if you can't start there for whatever reason, you can focus on how you spend time and money. And there's more to gain than you think.
Most of us still have hundreds of boring small improvements to make to save us time and money. We tend to overlook that, but a tiny change that saves you 1 minute of your time everyday, already saves you 6 hours per year. Time you can spend on learning a skill! It works the same with money.
Example in my life: clothing. I always thought there would not be much to improve there, I was never into expensive brands anyway. But looking closely, I was able to manage my wardrobe in a way that by now (years later) must have saved me a few hundred hours of time, thousands of dollars and a lot of worries. Plus I feel better about how I look. All it took was some attention and persistance.
So I just keep screening my life habits looking for things to improve. I never stop. And it's fun.
One forgotten benefit of freeing up time is: less stress, less hurry. Think about when you left something important somewhere and it took a lot of effort to get it back. Were you short on time? Most bad things happen when we're stressed. Most accidents happen when we're in a hurry.
So what are improvements you made that a lot of people overlook?