Fortnite is adding ranked play in case you need another way to find out you're not good enough

pcgamer.com:

Fortnite has temporarily had leaderboards before, with limited-time modes like Solo Showdown and Blitz Showdown adding more competitive options, and Arena mode has its Hype Score and Bus Fare, but now the long-running battle royale is adding a way to determine your worth by labeling yourself Silver or Gold or whatever. As the Fortnite Team at Epic has announced, Arena is being discontinued and ranked play will arrive in the v24.40 update(opens in new tab).

Rank improvement will be based on the number of kills a team or solo player scores in a match (with kills later in the match and kills of high-rank players worth more), as well as their placement at the end. A progress bar tracking how far players are from either hitting the next rank or falling back down to the previous one will appear on the left side of the lobby screen, and team matchmaking will be based on the highest-ranked member of each team.

A handful of balance changes will affect ranked play: 

Players will be able to work their way up through eight categories: Bronze, Silver, Gold, Platinum, Diamond, Elite, Champion, and Unreal. Everything from Bronze through Diamond will be divided into three ranks, while Elite, Champion, and Unreal will each contain a single rank. Hitting Unreal will mean you stay at that rank for the rest of the season, and get to join the leaderboard, with a number after your name tracking your standing on it. 

Ranked play will be an option in both battle royale (solo, duos, and squads) and zero build (duos), with a separate rank tracked for each. Just set the toggle in the lobby before finding a match to turn it on—though new players will have to complete a quest to outlast 500 opponents before they can enter ranked play.

Ranked Season