With the 2019 world cup success, the players could have parleyed the attention that came with it into a new and more prestigious TV deal for the NWSL. TV and sponsorship deals are the catalysts that have driven the incredible boom in what athletes earn in 2020 as opposed to decades past. Sure, attendance plays a role, but it is a minor role. Fewer people attend games now than they did in the decades past across all sports as more people settle for an opportunity to watch and stream games from home.
The more lucrative a TV deal, then the more money the league earns, the more money the league earns, then the more they can increase the salary of individual players.
The reason the average Premier League player earns around 4 million dollars a year, as opposed to 31 thousand dollars a year in 1985, is not because 4 million dollars worth of people are going to games now. It is because the Premier League currently earns 12 billion a year just in TV Deals.
In the aftermath of the 2019 World Cup success, the world's attention was on the women's national team. A group of players that proved for the second straight tournament that they were indeed the most dominant in the world. They brought pride to Americans of all kinds and brought the attention of the world to women's soccer in the United States.