More money would make the situation worse. They need competent leadership. Everyone like to just say “add more money” because it means no actual operational change to the status quo.
The FAA already has competent leadership and staff. They don't have the budget to handle the increasing number of tasks they have been given to manage.
The FAA manages more flights and space launch operations than it did in the 1980s, when it had a budget more than quadruple the size.