There's a common belief in the NFL world that successful teams build through the draft. In many aspects, this is true. Building a "dream team" through free agency doesn't work the way it does in other sports. When it does work, the financial implications rarely lead to sustained success.
Exceptions exist, of course, like the 2020 Tampa Bay Buccaneers. Key contributors to their championship run like Tom Brady, Shaquil Barrett, Leonard Fournette and Ndamukong Suh came to Tampa through free agency. Teams can and will continue trying to complete their championship puzzles through the open market.