[SatvikBeri]

Just to add to this, I spent roughly the first two years of my career with 80% of my attention on reducing expenses at 20% on earning more. I got about the same amount of money from both. Later on I shifted that ratio, and significantly increased my income over the next two years. I did increase my expenses, but I'm saving much more as both a percentage of my income and as an absolute quantity.

It's also helpful because the same technique that helped me earn an X% raise has worked over and over again, with roughly the same results. So when you learn to negotiate, you're changing the rate at which your income grows, as opposed to a one-time increase in income. That has a massive effect in the long term.