Actually in 2019 the Nationals had the seventh highest payroll by SporTrac.
The thing is that you're letting the tail wag the dog, which is a classic sports trope. Every season in literally every sport, people praise the champion and then many try to emulate that formula.
Except there's a new champion every year and their formula is different every year.
For example, the Jays went big this season and will likely be worse next season. They did all the things right, still lost, and now will lose Ray and Semien.
Baseball is painfully random and there are dozens of ways to win. The Giants are currently winning with a collection of old men on crutches. Good for them.
There are so many ways to win, try to enjoy the ride.